How Facebook Picks Your People You May Know

Facebook’s “People You May Know” (PYMK) feature suggests friends by combining your activity, contact lists, and your existing friends’ activity. It is not random. The algorithm prioritizes people you have a high chance of actually knowing, based on shared connections, contact information, and behavioral signals. This guide breaks down the exact factors Facebook uses and how you can influence the suggestions you see.

What You’ll Need

• An active Facebook account (desktop or mobile app)
• Access to your Facebook settings and privacy controls
• Your phone’s contact list (if you want to manage contact-based suggestions)

Step-by-Step

1. Understand the primary signal: mutual friends. Facebook’s core assumption is that people who share many friends are likely to know each other. If you have 15 mutual friends with someone, they will appear much higher in your PYMK list than someone with 2 mutual friends. This is the single strongest factor in the algorithm.
2. Check your contact list upload. Facebook compares the phone numbers and email addresses in your uploaded contacts with those of other users. If your phone has a contact saved for “John Smith” with a phone number, and that number matches a Facebook account, John will appear in your suggestions. To see this: On mobile, go to Settings & Privacy → Settings → Mobile and check if “Continuous Contact Upload” is on. On desktop, go to Settings & Privacy → Settings → Your Facebook Information → Contact Uploading.
3. Look at your network’s behavior. If your friends have recently added a particular person, Facebook will likely suggest that person to you. The algorithm assumes that if your close friends are connecting with someone, you probably know them too. This is why you often see suggestions right after a friend adds someone new.
4. Review your profile information. Facebook uses your current city, hometown, workplace, school, and other profile details to match you with people who list the same details. If you went to “Lincoln High School” and another user also lists it, you become a candidate for each other’s PYMK lists. Keeping your profile updated increases the accuracy of these matches.
5. Notice your group and event participation. Being in the same Facebook group or RSVPing to the same event as another person is a weaker but real signal. If you and another user are both active in a local gardening group, Facebook may suggest them, especially if you have no other connections.
6. Consider the “people you’ve met” factor. Facebook tracks your physical proximity through your phone’s location services (if enabled). If you and another user are frequently at the same place at the same time (e.g., a gym or workplace), Facebook may infer you know each other and add them to your suggestions.
7. Use the “X” button to train the algorithm. When you dismiss a suggestion by clicking the X, Facebook takes that as a negative signal. It will show you fewer people like that person. Conversely, if you click “Add Friend” on a suggestion, Facebook learns that its signals were correct and will show you more people with similar connection patterns.
8. Check your “Hidden” list. If you have previously dismissed someone, they go into a hidden list. You can manage this: Go to Settings & Privacy → Settings → Privacy → People You May Know. Here you can see who you’ve hidden and choose to unhide them if you changed your mind.

Common Mistakes

• Assuming it’s only mutual friends. While mutual friends are the biggest factor, contact uploads and location data often surface people with zero mutual friends. Ignoring these other signals leads to confusion about why a stranger appears.
• Turning off contact upload entirely. If you want to see suggestions for people you actually know, disabling contact upload will remove a major source of accurate suggestions. You’ll get fewer, less relevant suggestions.
• Not using the X button. Many people ignore suggestions instead of dismissing them. The algorithm needs feedback. Ignoring is a neutral signal; dismissing is a negative one. Use the X to improve your future suggestions.
• Expecting privacy to hide you from suggestions. Your privacy settings control who can see your profile, but they do not remove you from other people’s PYMK lists. To stop being suggested entirely, you need to adjust who can send you friend requests (set to “Friends of Friends” or “Everyone” still allows suggestions).

Tips

• Curate your contact list. If you have old numbers or email addresses of people you don’t want to be suggested, delete them from your phone’s contacts. Facebook will stop matching you with those accounts.
• Fill out your profile completely. Accurate workplace, school, and location data helps Facebook match you with the right people. A sparse profile relies more on weaker signals like groups and location.
• Be active in the groups you care about. If you want to meet people in a specific community, your participation in that group’s Facebook page will increase suggestions from that group.
• Dismiss suggestions in batches. Every few days, go to your PYMK page and dismiss the ones you don’t want. This keeps the list fresh and trains the algorithm faster than doing it one at a time.
• Use the “See All” link. The main PYMK widget on your homepage shows only a few people. Clicking “See All” shows a larger list, giving you more chances to find the person you’re looking for.

Troubleshooting

• You keep seeing the same irrelevant people. Dismiss them individually with the X. If they persist, go to Settings → Privacy → People You May Know and check if they are on your hidden list. If they are not, you may need to remove their contact info from your phone and wait a few days.
• You want to find a specific person but they never appear. Try searching for them directly. If they don’t appear in search, they may have restricted their profile visibility. If they appear in search but not in PYMK, they may have disabled friend suggestions for themselves (a setting on their end).
• Your PYMK list is empty. This usually happens with a new account or after a long period of inactivity. Facebook needs data to make suggestions. Start adding friends, upload your contacts, and fill out your profile. The list will populate within a few days.
• Suggestions are all strangers. This often happens if you have a large contact list uploaded but few mutual friends. Facebook is relying heavily on contact matching. Review your contacts and remove numbers for people you don’t actually know.
• You want to stop appearing in others’ suggestions. You cannot fully opt out, but you can reduce it. Set your “Who can send you friend requests” to “Friends of friends” (this limits suggestions to people with mutual connections). Turn off contact upload on your device, and avoid adding your work email to your profile if you don’t want coworkers suggested.

Frequently Asked Questions

Q: Does Facebook read my messages to find suggestions?
A: No. Facebook does not scan your private message content to generate PYMK suggestions. It uses metadata like mutual friends, contacts, and profile info, not the text of your conversations.

Q: Why do I see people I’ve never met?
A: This usually comes from contact list matching (someone has your number saved, or you have theirs) or from location data if you are often in the same place. It can also happen when you share many mutual friends with someone you haven’t actually met.

Q: If I block someone, will they stop appearing in PYMK?
A: Yes. Blocking someone removes them from your suggestions and you from theirs. They also cannot see your profile or send you messages. This is the most effective way to remove a specific person.

Q: Why does a person I already know not show up?
A: They may have turned off friend suggestions in their own privacy settings, or they may have restricted their profile so that Facebook’s algorithm doesn’t have enough data to match you. It can also take time for new connections to appear.

Q: Does deleting a mutual friend remove their friends from my suggestions?
A: It will reduce the strength of the signal. If you unfriend someone, their friends will have fewer mutual connections with you, so they will likely drop lower in your list or disappear if that was the only connection.

Q: How often does the PYMK list update?
A: Facebook updates it continuously, but you will typically see changes every few hours. Major changes happen when you add new friends, upload new contacts, or when people in your network change their friend lists.

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