Limiting the data we share online

Every day, without thinking about it, we SHARE a multitude of personal information online: by creating accounts, filling out forms, posting on social networks, accepting cookies, using applications. This data — about who we are, what we do, where we go, what we like — is collected, exploited, sometimes resold, and can be used against us (targeted scams, identity theft, privacy violations). Good news: you can greatly LIMIT what you share with a few simple habits. Here’s how to regain control of your online personal data.

Why limit the data you share

Becoming aware of the issue motivates you to act. What you SHARE without thinking: while browsing and using the internet, we leave a considerable trail — information voluntarily provided (name, age, address, contact details, in accounts and forms), PUBLISHED content (photos, messages, opinions on social networks), COLLECTED behaviors (what you search for, buy, watch, like, where you go); all of this constitutes our “personal data.” WHO collects it and WHY: many actors collect this data — websites, applications, social networks, advertisers, data brokers; data has great ECONOMIC value: it is used for TARGETED advertising (better knowing you to sell to you better), analysis, profiling, and is sometimes RESOLD; it’s often the “model” of “free” services (if it’s free, your data might be the product). The RISKS of sharing too much: PRIVACY (actors know a lot about you, your intimacy, your habits); TARGETED SCAMS (the more scammers know about you, the more credible and effective their scams are — our guides on recognizing phishing); IDENTITY THEFT (your information can be used to impersonate you — our guides on avoiding identity theft); DATA LEAKS (what you entrust to a site can leak if it’s hacked); PROFILING (being categorized, targeted, influenced without your knowledge); and a loss of CONTROL (once shared, a piece of data escapes your control; it can circulate, be stored, resurface). The PRINCIPLE of protection: the best way to protect data is to NOT share it in the first place; the less information you expose, the less it can be exploited or leaked; this is the principle of MINIMIZATION: only share what’s necessary. This isn’t paranoia: it’s digital common sense. What to remember to start: we constantly share personal data (voluntarily or through our behavior), collected and exploited by many actors (often for commercial purposes), with real risks (privacy, targeted scams, identity theft, leaks, profiling); LIMITING it — only sharing what’s necessary — is the best way to protect your privacy; and this is done with a few simple habits. Let’s see which ones.

Habits to limit what you share

Several simple habits greatly reduce the data you expose. THINK before you SHARE: on social networks and online, think before posting; once online, information escapes you (it can be copied, redistributed, stored); avoid exposing: your address, your full birth date, your absences (vacations: a boon for burglars), sensitive information, compromising photos or others’ without consent; ask yourself: “Do I really want this to be public and permanent?” ADJUST PRIVACY SETTINGS: on your social networks and accounts, check and tighten privacy settings (who can see your posts, your information); don’t leave everything set to “public” by default; limit visibility to your real contacts. ONLY GIVE the NECESSARY in FORMS: when a website/form asks for information, only fill in what’s actually REQUIRED (often marked with an asterisk); optional fields can often be left blank; ask yourself if the service really needs each piece of information; be wary of excessive requests. LIMIT ACCOUNTS and registrations: each account created is data entrusted to another actor (and another potential leak); don’t create an account for everything; use “guest” options when possible; close accounts you no longer use. MANAGE COOKIES: refuse non-essential cookies (via banners: click “refuse” rather than “accept all”), which are used for ad tracking (our guides on managing cookie banners). CONTROL APPLICATION PERMISSIONS: only grant apps the necessary access (location, contacts, microphone…); refuse what’s not justified (our guides on checking app permissions). LIMIT ADVERTISING TRACKING: enable settings that limit tracking between apps and ad targeting. USE a “SECONDARY” email address: for registrations with unimportant services, newsletters, a dedicated email address (different from your main one) prevents exposing your main email and drowning it in spam. PROTECT your DOCUMENTS and sensitive information: don’t share copies of ID, bank details, etc. (our guides on avoiding identity theft). THINK about PRIVACY-FRIENDLY search engines and browsers: there are search engines and browser settings more mindful of privacy; trackers blockers limit tracking. CHECK what’s found about you: search your name online from time to time to see what’s public; request the removal of anything that bothers you if possible. In summary: think before sharing, adjust privacy settings, only give the necessary in forms, limit accounts, manage cookies and permissions, limit ad tracking, use a secondary email for secondary purposes, and protect your sensitive information; these habits, applied daily, greatly reduce what you share.

The guiding principle: only share the NECESSARY (minimization). Faced with constant data collection, one principle guides all good habits: MINIMIZATION — only share what’s truly necessary, and nothing more. The reasoning is simple: the best way to protect personal data is to NOT share it in the first place; data you haven’t shared can’t be exploited, resold, leaked, or used against you; the less you expose, the less vulnerable you are. Apply this principle every time: when a FORM asks for information, only fill in the REQUIRED fields, leave optional ones blank, and ask yourself “Does this service really need this information?”; when you’re tempted to POST something on social networks, ask yourself “Is it necessary (and desirable) for this to be public and permanent?”; when an app asks for PERMISSION (location, contacts…), ask yourself “Does it really need it?” and refuse if not; when a site wants you to create an ACCOUNT, ask yourself “Do I need it, or can I do without?”; when a COOKIE banner appears, refuse non-essential cookies. This habit — “Is it necessary to share this information?” — applied systematically, greatly reduces your exposure, without major effort. A few very effective concrete applications: use a SECONDARY email address for unimportant registrations (protects your main email); tighten the PRIVACY of your social networks (limit visibility to your real contacts); never publicly expose your most sensitive information (address, absences, ID documents); refuse unnecessary permissions and cookies; close unused accounts. Minimization isn’t paranoia or a renunciation of the internet: it’s DIGITAL COMMON SENSE; you continue to enjoy services while keeping control of what you share, only giving what’s necessary. It’s the simplest and most powerful principle to protect your online privacy: every time you’re asked for data or tempted to share it, ask yourself if it’s necessary. This small habit, applied daily, makes a huge difference in what the digital world knows about you.

Regain control of your existing data

Beyond limiting what you share in the future, you can also regain control of data already exposed. TAKE STOCK of your ACCOUNTS: list the accounts and services you’re registered with; CLOSE those you no longer use (each inactive account is a dormant leak risk and lingering data); deleting an unused account removes your data from that actor. CHECK and TIGHTEN privacy: review the privacy settings of your social networks and main accounts; limit what’s public; delete old posts that expose too much. SEARCH what’s found about YOU: type your name in a search engine to see what’s public about you; you might be surprised; identify what bothers you. REQUEST removal or deletion: you have RIGHTS over your data; depending on regulations (like GDPR in Europe), you can ask a site/service to ACCESS your data, CORRECT it, and often DELETE it (right to erasure/right to be forgotten); you can request the removal of information or content about you; data protection authorities (like CNIL in France) inform you about these rights and can help. MANAGE data with MAJOR actors: major platforms offer privacy dashboards where you can see and manage collected data, disable certain collections, delete history; explore these settings. CLEAN your HISTORY and traces: you can often delete your browsing, search, and location history with the services you use. CHECK for LEAKS: services allow you to check if your email address has appeared in known data leaks; if so, change the affected passwords (our guides on managing passwords). LIMIT ADVERTISING PROFILING: in the settings of major platforms and your device, you can often limit targeted ads and tracking. EDUCATE your LOVED ONES: help your loved ones (children, elderly) protect their data and understand these issues; they are often less aware of the risks. STAY REALISTIC: you can’t erase or control everything (data has already circulated, some is hard to remove); the goal is to regain REASONABLE control, limit future damage and exposure, not achieve total invisibility (illusory); every action counts. In summary: take stock of your accounts (close unused ones), tighten privacy, search what’s found about you, exercise your RIGHTS (access, correction, deletion), manage data with major actors, clean your traces, check for leaks, and limit profiling; you can regain reasonable control of your existing data, in addition to limiting what you share in the future. It’s not perfect, but every action reduces your exposure.

Warning: once shared, data escapes your control — think BEFORE, not after. The most important principle to integrate: once data is SHARED or PUBLISHED, it ESCAPES you; it can be copied, redistributed, stored, resold, leaked, resurface years later; it’s often very difficult, if not impossible, to “reclaim” it completely; hence the importance of THINKING BEFORE sharing, not after. This is especially true for SOCIAL NETWORKS: what you post can become public and permanent; a photo, a message, shared information can follow you for a long time; think before posting, especially for: sensitive information, compromising or intimate photos, others’ data (including your children’s — protect their privacy; ask for consent before posting someone’s photo), opinions that could harm you, and your ABSENCES (announcing you’re on vacation = empty house, a boon for burglars). Beware of FORMS and EXCESSIVE requests: be wary of services that ask for much more information than necessary; only fill in the required fields; a disproportionate data request should raise suspicion (especially very sensitive information). Beware of “FREE” services: many make money by collecting and exploiting your data (“if it’s free, you might be the product”); it’s not necessarily bad, but be aware and read what you accept. Beware of SENSITIVE data: certain information is particularly important to protect (ID documents, bank details, health data, very personal information); only share it with trusted actors and through secure channels, never lightly. Beware of PHISHING: scammers try to get you to share your data; never share it in response to an unsolicited message (our guides on recognizing phishing). Beware of your LOVED ONES’ data: by giving access to your contacts, posting photos of others, you also expose OTHERS’ privacy (not just yours); respect it. Beware of falling into the opposite extreme (paranoia that prevents you from using the internet): the goal is REASONABLE control, not deprivation or anxiety; you can enjoy the digital world while limiting what you share. Finally, stay REALISTIC: you can’t control everything (data already circulates, leaks happen), but limiting what you share and exercising your rights greatly reduces risks; every action counts. By thinking BEFORE sharing data (because after, it’s often too late), only giving what’s necessary, and protecting sensitive information and that of your loved ones, you keep control of your online privacy — without paranoia, but with common sense.

Frequently asked questions

Why do my personal data have value?

Because they allow you to be BETTER KNOWN, which interests many actors, especially for advertising. Your data — who you are, what you search for, buy, watch, like, where you go, your habits — paints a DETAILED PORTRAIT of you; this portrait has great ECONOMIC value. Why? Mainly for TARGETED ADVERTISING: the more an advertiser knows you, the more they can show you ads tailored to your interests, at the right time, therefore more effective; targeted ads sell much better than generic ads; your data fuels this system. Also for ANALYSIS and PROFILING: categorizing users, understanding behaviors, predicting desires. And sometimes, your data is outright RESOLD to “data brokers” who aggregate and sell it. That’s why so many services are “FREE”: the real business model of many is the collection and exploitation of your data; the saying “if it’s free, it’s probably you the product” sums this up; you don’t pay in money, but in data (and ad attention). It’s not necessarily malicious, and many useful services work this way; but it’s important to be AWARE: when you use a free service, think about what it collects in exchange. The IMPLICATIONS: as your data is valuable, there’s a strong incentive to collect AS MUCH as possible, sometimes more than necessary; hence the importance of LIMITING what you share. The value of your data also explains why it can be used against you: in the wrong hands (leak, resale to unscrupulous actors, scammers), this detailed portrait of you can be used for targeted scams or identity theft. In summary: your data has value because it allows you to be better known and targeted (especially for advertising), which is the model of many “free” services; being aware helps understand why limiting what you share protects both your privacy and security.

How to know what data you share?

Become aware of the different ways you share data, often without thinking. Data VOLUNTARILY given: everything you enter when creating accounts, filling out forms, registering (name, age, address, contact details, preferences); this is the most visible. Data PUBLISHED: what you share on social networks and online (photos, messages, opinions, location of your posts); often public and permanent. Data from BEHAVIOR collected automatically: what you search for, the sites you visit, what you buy, watch, like, the time you spend, your location; this data is collected in the background (via cookies, tracking, apps) without you consciously “giving” it; it’s often the most important in volume, and the least noticed. To KNOW concretely what you share: search your NAME online (see what’s public about you — sometimes surprising); explore the PRIVACY dashboards of the major platforms you use (they often show collected data, history, interests they attribute to you: instructive!); check the PERMISSIONS granted to your apps (who has access to your location, contacts… — our guides on checking permissions); consult the data collection summaries of apps (often displayed on app stores); check if your email has appeared in known DATA LEAKS (services allow this). These steps give you a concrete idea of the extent of what you share, which often exceeds what you imagine. Awareness is the first step: once you REALIZE everything you share (information given, content published, behaviors collected), you naturally adopt limiting habits. In summary: you share data in three ways (voluntarily given, published, and automatically collected behaviors); to measure this, search your name online, explore privacy dashboards of platforms, check app permissions, and check for leaks; this awareness motivates you to limit what you expose.

Is it possible to really protect your online privacy?

Yes, to a large extent, provided you’re realistic: you can’t control everything, but you can greatly REDUCE your exposure. The reality: ABSOLUTE protection (total invisibility, no data collected) is illusory for an ordinary user who wants to enjoy the internet; data already circulates, leaks happen (independent of your will), and using services implies entrusting some. Don’t aim for perfection or paranoia that would prevent you from using digital tools. BUT you can greatly LIMIT what you share and regain REASONABLE control, which considerably reduces risks; and every action counts. Effective levers: applying MINIMIZATION (only share what’s necessary: forms, posts, accounts, permissions, cookies); tightening the PRIVACY of your networks and accounts; using a secondary email for secondary purposes; refusing ad tracking and non-essential cookies; closing unused accounts; exercising your RIGHTS (access, correction, deletion of your data; content removal); using privacy-friendly tools (search engines, tracker blockers). These actions, combined, make a real difference in what the digital world knows about you and your exposure to risks (scams, identity theft, profiling). The goal is therefore REASONABLE control and a SIGNIFICANT reduction in exposure, not perfect invisibility; this is achievable with simple habits, without giving up digital uses. Consider this as DIGITAL HYGIENE: just as you lock your door without living barricaded, you protect your privacy with good habits without cutting yourself off from the world. In summary: yes, you can really protect your online privacy to a large extent, by limiting what you share and exercising your rights; not perfectly (be realistic), but enough to greatly reduce risks; every habit counts, and the whole makes a real difference, without paranoia or renunciation.

What to remember

We CONSTANTLY share personal data online, often without thinking: information given (accounts, forms), content published (social networks), and behaviors automatically collected (searches, purchases, location, interests). This data has great VALUE (especially for targeted advertising: the model of many “free” services) and is collected, exploited, sometimes resold; sharing too much exposes you to REAL RISKS: privacy violations, TARGETED SCAMS (more credible with your info), identity theft, data leaks, profiling, and loss of control. The guiding PRINCIPLE: MINIMIZATION — only share the NECESSARY; the best way to protect data is to not share it; every time you’re asked or tempted to share, ask yourself: “Is it necessary?”. The HABITS to limit: think BEFORE posting (once shared, data escapes you: copied, permanent, resellable; beware of sensitive info, absences, others’ data); tighten the PRIVACY of your networks and accounts; only fill in REQUIRED fields in forms; limit ACCOUNTS (close unused ones); refuse NON-ESSENTIAL cookies and ad tracking; control APP permissions; use a SECONDARY email for secondary purposes; protect your SENSITIVE information (ID documents, bank details). You can also REGAIN control of your existing data: take stock of your accounts, search what’s found about you, exercise your RIGHTS (access, correction, DELETION — you have rights over your data), manage privacy settings of major platforms, clean your traces, check for leaks. Warning: once shared, data escapes your control (think BEFORE), beware of excessive requests and “free” services (you pay in data), never share sensitive data in response to an unsolicited message (phishing), and protect your LOVED ONES’ privacy (others’ photos, contacts). Stay REALISTIC: absolute protection is illusory, but you can greatly reduce your exposure and regain reasonable control; this isn’t paranoia or a renunciation of the internet, but DIGITAL HYGIENE: common sense, applied daily. Every habit counts, and the whole makes a real difference in what the digital world knows about you, and your protection against scams and identity theft.