Facebook People You May Know: How It Actually Works (2026)

Two things bring people to this topic. The first is a name that appeared in People You May Know that should not be there: an ex, someone you specifically unfriended, a stranger who somehow shows up anyway. The second is wanting to stop appearing in other people’s suggestions. Both have direct answers, and understanding how the algorithm actually works is the fastest path to both.

How Facebook’s People You May Know Algorithm Actually Works

Facebook’s People You May Know feature uses multiple overlapping signals simultaneously rather than relying on any single factor. Meta’s own transparency documentation at transparency.meta.com describes the core inputs.

Mutual Friends

The strongest and most consistent signal. If you and another person share one or more mutual friends, that connection raises your likelihood of appearing in each other’s suggestions. The more mutual friends you share, the stronger the signal. This is why People You May Know often feels accurate: the people in your extended social network genuinely do tend to know each other.

Shared Background Information

Facebook uses profile information you have added your employer, your school, your hometown, your current city to surface connections who share those characteristics. If you both listed the same university, the same company, or the same hometown, that overlap contributes to the suggestion even if you have no mutual friends.

Contact Sync

If you have ever allowed Facebook to access your phone’s contacts, Facebook compares those contacts against its user database. Anyone in your phone’s address book who also has a Facebook account linked to that phone number or email address can appear in your suggestions, and you can appear in theirs even if you have no mutual friends and no shared profile information.

This is one of the most surprising sources of unexpected suggestions. Someone who gave you their business card two years ago and whose number is still in your contacts can appear in People You May Know if they are on Facebook.

Device and Network Signals

Facebook collects device and network data as permitted by its terms of service and applicable privacy regulations. People who frequently use the same Wi-Fi network, whose devices are in the same location at the same time, or who have other co-location signals can appear in each other’s suggestions. The specifics of how heavily this is weighted are not fully disclosed by Meta, but independent researchers have documented cases where strangers who shared a network at a coffee shop, at a conference, or at a medical facility appeared in each other’s suggestions shortly afterward.

Groups and Events

Being in the same Facebook Group or having attended the same Facebook Event creates a connection signal. You may not be friends with every member of a group, but the shared membership creates enough overlap for the algorithm to surface some of those members as suggestions.

Does Facebook Suggest People Who Looked at Your Profile?

No. This is the most persistent myth about People You May Know, and it is worth addressing directly.

Facebook does not surface people in suggestions because they viewed your profile. Profile views are not used as a People You May Know signal, and Facebook does not reveal who has viewed your profile to anyone, not through suggestions, not through any other feature, and not through any third-party tool, despite what those tools claim.

Why the myth persists:
The confusion comes from a real correlation that is not causation. If someone looked at your profile, they probably share mutual friends with you, attended the same school, or have some other genuine connection, which is also why they searched for you. Those same background signals that led them to find your profile are also the signals that make you appear in their People You May Know. The suggestion does not mean they looked at you. It means you share the same background signals that brought them to your profile in the first place.

This distinction matters because third-party apps claiming to show you who viewed your profile and charging for that information are exploiting the myth rather than delivering real data. Facebook’s API does not expose profile view information to external applications. Any tool claiming to provide it is fabricating results.

Why Someone You Did Not Expect Keeps Showing Up

Several specific patterns explain the suggestions that feel most surprising or unwelcome.

An ex or someone you unfriended:
Unfriending someone removes the direct friend connection but does not remove the shared signals that drive suggestions. If you have mutual friends in common, attended the same school, or worked at the same company, those signals remain active even after you unfriend. Blocking is the only action that fully removes someone from your suggestions and you from theirs.

Someone you met briefly or never met in person:
A phone number exchanged at a networking event, a colleague you emailed once, or anyone whose contact information ended up in your phone can appear through contact sync. The algorithm treats contact list overlap as a relationship signal regardless of how the contact was obtained or how brief the interaction was.

A complete stranger with no apparent connection:
This is the case that concerns people most. When someone with no mutual friends, no shared profile information, and no apparent connection appears in suggestions, the most likely explanation is contact sync (you are in each other’s phone contacts without knowing it), location co-occurrence (you were at the same place at the same time with location access enabled), or a second-degree connection through someone you do not realize you have in common.

The scam angle:
People You May Know is also a surface that scammers deliberately exploit. A fake profile optimized to appear in suggestions, with mutual friends added, shared group memberships created, and enough background signals to appear legitimate, can surface in your suggestions as a first contact attempt. A suggestion from a profile with only a handful of friends, a recently created account, and professional-looking photos is worth verifying before accepting a friend request.

How to Stop Showing Up in Other People’s Suggestions

These settings reduce how often you appear in others’ People You May Know lists. No single setting eliminates appearances entirely since the algorithm uses multiple signals, but the combination below covers the most significant ones.

Adjust Your Audience Settings

• Go to Settings and Privacy then Settings then Privacy
• Under How People Find and Contact You, review each setting
• Set Who can send you friend requests to Friends of Friends rather than Everyone
• This does not directly remove you from suggestions but reduces the population of people who can act on a suggestion by sending a request

Turn Off Contact Sync

• Go to Settings and Privacy then Settings
• Select Your Facebook Information then Off-Facebook Activity
• Manage your Off-Facebook Activity and review which apps have shared contact data with Facebook
• To stop future contact sync: on mobile, go to Settings then Privacy Shortcuts then Manage Your Privacy and look for the contacts upload setting

Turning off contact sync stops future contact data from being shared but does not retroactively remove contact data already uploaded. For that, use Facebook’s Contact Uploading and Inviting settings to clear previously uploaded contacts.

Revoke Location Access

• On your device’s operating system settings (not within Facebook), find Facebook in your app list
• Set location access to Never or While Using the App rather than Always
• This reduces the location co-occurrence signal that can drive suggestions based on shared physical presence

Edit Your Background Information

• Go to your profile and edit the About section
• Consider removing or restricting the audience for your employer, schools, and hometown
• Setting these to Only Me removes them as shared-signal contributors for the suggestion algorithm

Block Specific People

Blocking is the only complete solution for a specific person. When you block someone, they cannot see your profile, they cannot appear in your suggestions, and you cannot appear in theirs.

• Go to the person’s profile
• Tap the three-dot menu
• Select Block

Verify Who Is Actually Behind a Suggested Profile

People You May Know suggestions from profiles that look professionally polished but have few connections, recent creation dates, or photos that seem unusually high-quality for a casual user are worth verifying before any engagement.

Reverse Image Search the Profile Photo

Save their profile photo and upload it to Social Catfish’s reverse image search. The facial recognition finds where that face appears online and under what names.

What this catches:
Fake profiles in People You May Know frequently use photos stolen from real people’s social media or from stock image libraries. A photo that traces back to someone else’s Instagram, a model portfolio, or another person’s verified account under a different name confirms the suggested profile is not what it appears to be, regardless of how many mutual friends it shows.

Cross-Reference the Name and Username

Enter any name or identifier from the profile into Social Catfish’s cross-platform search. The search returns every platform where that identity is active alongside the real identity connected to it. A genuine person with a real Facebook account has a corresponding presence on other platforms with a history that is consistent with what their Facebook profile claims. A fabricated profile typically exists only on Facebook or surfaces under inconsistent identities across platforms.

All Social Catfish searches are completely confidential. The person being searched receives no notification.

FAQ

Conclusion

People You May Know is driven by overlapping signals: mutual friends, shared background information, contact sync, location data, and group membership, not by profile view tracking, which is the most common misconception about how it works. Unexpected suggestions are almost always explained by one of these signals rather than by someone actively seeking you out. Reducing your appearance in others’ suggestions requires addressing those signals at their source: turning off contact sync, revoking location access, restricting background information, and blocking specific people when necessary. When a suggested profile raises a question about whether it is genuine, a reverse image search through Social Catfish answers it before any friend request is accepted.