# How does Facebook link accounts?

> Facebook links accounts you add to Accounts Center, and connects others itself through device identifiers, cookies, IP addresses and payment details.

Source: https://mosaicbrowser.com/guides/how-does-facebook-link-accounts

## How does Facebook link accounts?

You link accounts yourself by adding them to Accounts Center. Meta also connects accounts on its own, from what its privacy policy says it collects (device identifiers, cookies, your network and IP address, purchase details) and acts on accounts owned by the same person.

![What Facebook reads to connect accounts, beside a screenshot: a profile fingerprint in Mosaic: GPU, screen, fonts, timezone and language matched to the exit](https://mosaicbrowser.com/covers/how-does-facebook-link-accounts.webp)

"How does Facebook link accounts" has two answers, and people searching it usually want the second.

The first is the link you make yourself. Accounts Center lets you add your Facebook and Instagram accounts to one place. Meta's privacy policy says that for some purposes it uses information "across Meta Company Products from the accounts you choose to add to your Accounts Center, and across your devices" ([Meta Privacy Policy](https://www.facebook.com/privacy/policy/?subpage=1.subpage.3-AppBrowserAndDevice), effective 23 July 2026, read 2 November 2026).

The second is the link Meta makes without asking: deciding that two accounts, Pages or ad accounts belong to the same person. That is what this page is about, and Meta says more about it in public than most people realise.

## What Meta says it does with linked accounts

Meta's Account Integrity policy lists accounts and business assets it "may restrict or disable", including ones "owned by the same person or entity as an account that has been disabled", ones "created or repurposed to evade a previous account or entity removal", and ones showing "close linkage with a network of accounts or other entities that violate or evade our policies" ([Account Integrity](https://transparency.meta.com/policies/community-standards/account-integrity-and-authentic-identity/), read 2 November 2026). The advertising side repeats it: a business asset "found in close connection with a network of accounts" that break the rules can be restricted ([policy violation examples](https://www.facebook.com/business/help/3858246497787265), read 2 November 2026).

So the linking exists to carry an enforcement decision from one account to the others behind it. Facebook's terms add the personal rule underneath: one account per person, and no new account after a disable without Meta's permission ([Facebook Terms, 3.1](https://www.facebook.com/terms/), read 2 November 2026).

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## How Facebook links accounts: the signals it reads

Meta does not publish how it weighs anything. What it does publish is the list of what it collects, and the useful version of this question is which of those items two accounts can share.

**Your device.** The privacy policy's device section lists "device characteristics and device software", "identifiers that tell your device apart from other users'", "device signals" and "information from cookies and similar technologies". In a browser, device characteristics are the values any page can read: the GPU, the screen, fonts, the timezone and language. Combined, they make a [browser fingerprint](https://mosaicbrowser.com/glossary/browser-fingerprint) that stays the same when cookies are cleared.

**How you behave on it.** The same list includes "what you're doing on your device, such as whether our app is in the foreground or if your mouse is moving (which can help tell humans from bots)". Two accounts driven the same way from the same machine look alike here too.

**Your network.** The policy lists "information about the network you connect your device to and your connection, including your IP address", plus location-related information. An IP is weaker than people think. A household, an office and a mobile carrier all put many people behind one address, which is why a shared IP alone is rarely the whole story ([multiple accounts on the same IP address](https://mosaicbrowser.com/guides/multiple-accounts-on-the-same-ip-address) covers when it matters).

**Your money.** Meta records "purchases or other transactions you make, including truncated credit card information". Its billing help adds that one payment method can typically be added to "up to 10 ad accounts" ([Fix a failed payment issue](https://www.facebook.com/business/help/268196136699959), read 2 November 2026). A card has one holder. Ad accounts paid by the same card are linked by a fact no browser setting touches.

**Who you are.** Email addresses, phone numbers and, when Meta asks for one, a photo of an ID. These are the strongest links of all, because they were given to prove identity.

| Signal | Shared when | A browser can keep it apart? |
| --- | --- | --- |
| Cookies and local storage | Two accounts in one browser | Yes, with one profile per account |
| Device and browser values | Same computer, same browser | Yes, if each profile has its own |
| IP address and location | Same network | Only with a different exit per profile |
| Card, phone, email, ID | Same person paid or verified | No |

## Why a normal browser mixes accounts

Two Facebook logins in one Chrome window share everything in the first two rows of that table. Chrome's own profiles separate cookies but run on the same machine, so the device values a page reads are the same in all of them. For one person with one account, none of this matters. For an agency account manager signed in as themselves while also holding a client's shop admin and analytics logins, it means one browser carries traces of every client at once.

## What a separate profile changes, and what it doesn't

We make Mosaic, a browser that gives each profile its own cookie jar, its own fingerprint drawn from real hardware and changed inside the engine, and its own proxy exit, with timezone and language matched to that exit.

![Mosaic profile editor, Fingerprint tab: identity seed, Europe/Berlin timezone, German language and geolocation matched to the exit](https://mosaicbrowser.com/shots/fingerprint-detail.png)
*Locale and location drawn for the profile's own exit*

That keeps client logins from mixing, which is what we built it for. It does not change the last row of the table, and it does not change Facebook's rule. One person still gets one personal Facebook account, and an account opened after a disable breaks the terms whichever browser it is opened in; we will not help set one up. The legitimate set-ups Meta offers instead of a second account are in [can you have two Facebook accounts](https://mosaicbrowser.com/guides/can-you-have-two-facebook-accounts).

![Mosaic new profile editor: a Berlin proxy checked, its exit IP and ISP, and the identity matched to that exit](https://mosaicbrowser.com/shots/profile-editor.png)
*Each profile carries its own exit*

How the same separation is used across platforms, and where it stops, is in [how to manage multiple accounts without getting linked](https://mosaicbrowser.com/guides/how-to-manage-multiple-accounts-without-getting-linked). The agency set-up, with a project per client and each login in its own profile, is in [Mosaic for agencies](https://mosaicbrowser.com/use-cases/agencies).

## Sources

1. [Meta Privacy Policy (effective 23 July 2026): App, browser and device information](https://www.facebook.com/privacy/policy/?subpage=1.subpage.3-AppBrowserAndDevice), read November 2, 2026
2. [Meta Transparency Center: Account Integrity](https://transparency.meta.com/policies/community-standards/account-integrity-and-authentic-identity/), read November 2, 2026
3. [Meta Business Help Center: Common examples of Meta advertising policy violations](https://www.facebook.com/business/help/3858246497787265), read November 2, 2026
4. [Meta Business Help Center: Fix a failed payment issue on Meta](https://www.facebook.com/business/help/268196136699959), read November 2, 2026
5. [Facebook Terms of Service, 3.1 Who can use Facebook](https://www.facebook.com/terms/), read November 2, 2026

## Questions

### Can Facebook tell if two accounts use the same device?

Meta's privacy policy says it collects identifiers that tell your device apart from other users', device signals, device characteristics and information from cookies. It does not publish how it weighs them, but a shared device is the plainest link there is.

### Does Facebook link accounts by IP address?

Meta's privacy policy lists information about the network you connect to, including your IP address. An IP is a weak signal on its own, because homes, offices and mobile carriers share addresses between many people.

### Does using the same card link Facebook ad accounts?

Meta records purchases, including truncated card information, and its billing help says one payment method can typically be added to up to 10 ad accounts. A card is tied to its holder, so ad accounts paid by one card point to one payer.

### Is linking Facebook and Instagram in Accounts Center the same thing?

No. Accounts Center is a link you choose, and Meta's privacy policy says it uses information from the accounts you add there. Meta's own detection of related accounts happens whether or not you add anything to Accounts Center.

### Will a separate browser stop Facebook from linking my accounts?

It keeps cookies and device values apart, which is useful for keeping client logins from mixing. It does not hide a shared card, phone number, email or ID, and it does not make a second personal account allowed under Facebook's terms.

## Related

[Can you have two Facebook accounts?](https://mosaicbrowser.com/guides/can-you-have-two-facebook-accounts): No, you can't have two personal Facebook accounts: Meta's terms allow one per person. A business gets a Page, and new additional profiles can't be created.

[How to manage multiple accounts without getting them linked](https://mosaicbrowser.com/guides/how-to-manage-multiple-accounts-without-getting-linked): Accounts get linked by shared cookies, IPs, fingerprints and habits. Give each its own profile, exit and history, then test it before you trust it.

[Multiple accounts on the same IP address: is it a problem?](https://mosaicbrowser.com/guides/multiple-accounts-on-the-same-ip-address): Multiple accounts on the same IP address are normal: homes, offices and mobile carriers share one. It matters when the accounts share more than the IP.

[Browser fingerprint: what a site can read about your machine](https://mosaicbrowser.com/glossary/browser-fingerprint): A browser fingerprint is the set of values a site reads about your browser and computer, which together recognize you without cookies. What goes into one.

[How to check your browser fingerprint, and read the result](https://mosaicbrowser.com/guides/check-your-browser-fingerprint): How to check your browser fingerprint: a uniqueness test says how rare it is, a consistency scanner whether it could be real. Run each twice.

[Anti-detect browser for agencies: a browser per client](https://mosaicbrowser.com/use-cases/agencies): An anti-detect browser for agencies puts every client in its own project and every client login in its own profile, with that client's exit and 2FA codes.

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## Run this guide on your own accounts

Every Mosaic profile is a fingerprint, a proxy exit and a cookie jar that agree with each other, kept on your computer. Free holds 3 profiles. Pro is $49 a month for any number.

Mosaic is a desktop app

Email yourself the link and open it on your computer.