Why Does Instagram Suggest Certain Accounts? The Algorithm Explained (2026)

Instagram suggests accounts based on a combination of your mutual connections, phone contacts, browsing behavior, content interests, location data, and linked Facebook account. The algorithm processes hundreds of signals to predict which accounts you are most likely to want to follow. No single factor determines suggestions — it is always a weighted combination.

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The 8 Factors Behind Instagram Suggestions

Instagram has never published the exact formula for its suggestion algorithm, but through extensive testing, user reports, and engineering blog posts from Meta, we know the primary factors.

Factor 1: Mutual Followers

This is the strongest signal. If you and another person share 10 mutual followers, Instagram strongly assumes you know each other or would be interested in their content. The math is simple: if many people you trust follow this account, you probably should too.

How it works:

• Instagram counts the overlap between your following list and theirs
• The more mutual connections, the higher they rank in suggestions
• Recent mutual follows weigh more heavily than older ones

Factor 2: Phone Contact List

When you sync your contacts with Instagram (which many people do during initial app setup and then forget about), Instagram matches phone numbers to Instagram accounts. Anyone in your phone becomes a suggestion candidate.

This is responsible for many "how did Instagram know?" moments:

• A new coworker whose number you just saved
• An old friend you have not spoken to in years
• A delivery person whose number is in your recent calls
• Your dentist's office

To check: Settings > Account > Contacts syncing. You can turn this off and clear synced contacts.

Factor 3: Profile Browsing History

Instagram tracks which profiles you visit, how long you spend on them, and how often you return. If you repeatedly visit someone's profile without following them, Instagram interprets this as strong interest and may suggest them.

This also works in reverse. If someone frequently visits your profile, they might appear in your suggestions because the algorithm detects a bidirectional interest pattern. However, this is NOT confirmed, it could be coincidence.

Factor 4: Content Interaction Patterns

The content you engage with tells Instagram about your interests. If you consistently like fitness content, Instagram will suggest fitness creators. The signals include:

• Posts you like, comment on, save, and share
• Reels you watch to completion (vs. skip)
• Explore page content you engage with
• Hashtags you follow or frequently view

Factor 5: Facebook Social Graph

If your Instagram is linked to a Facebook account (through Meta Accounts Center), Facebook's social graph data influences your suggestions. This includes:

• Facebook friends who have Instagram accounts
• People in the same Facebook groups
• Event co-attendees
• Marketplace interactions

Factor 6: Location Signals

With location permissions enabled, Instagram may suggest accounts that are geographically near you. This includes:

• People who post from your neighborhood
• Local businesses
• Accounts that frequently geo-tag locations you visit

Factor 7: Search History

Your Instagram search history directly influences suggestions. If you search for a username but do not follow them, they may appear in your suggestions later. Clearing your search history reduces this effect.

Factor 8: Device and Account Metadata

Instagram uses technical signals:

• Shared IP addresses (same Wi-Fi network = same household)
• Similar device registration times (accounts created around the same time)
• Account switching patterns (if you switch between accounts on the same device)

Common "Why Is This Person Suggested?" Scenarios

"Instagram suggested my ex's new partner"

Most likely cause: You still share mutual followers with your ex. When your ex follows a new person, that person enters your extended social graph and becomes a suggestion candidate.

"Instagram suggested someone I just met in person"

Most likely causes: Contact syncing (if you exchanged numbers), shared location data, or connecting to the same Wi-Fi network.

"Instagram suggested someone I have never heard of"

Most likely cause: Content interest matching. They create content similar to what you engage with, even if you have no social connection.

"Instagram keeps suggesting the same person"

Instagram's suggestion algorithm is persistent. If the signals remain strong (mutual followers, contact sync, etc.), the same account will keep appearing. Tapping "X" to dismiss the suggestion helps but may not permanently remove it.

How to Stop Certain Suggestions

If you want to prevent specific types of suggestions:

1. Remove contacts sync: Settings > Account > Contacts syncing > Off
2. Unlink Facebook: Settings > Accounts Center > Remove Facebook
3. Clear search history: Settings > Security > Search history > Clear all
4. Disable location: Phone Settings > Instagram > Location > Never
5. Dismiss suggestions: Tap X on any suggestion to train the algorithm
6. Limit Explore browsing: Reduce time on Explore to reduce interest-based suggestions

What Suggestions Reveal About Activity

Instagram suggestions can indirectly reveal information about social connections and activity patterns. When someone new appears in your suggestions, it often means something changed in your social graph. A mutual follower recently connected with that person, or the suggested person joined Instagram and synced contacts that include you.

For direct tracking of social graph changes, rather than algorithmic guesses, tools like Lurk monitor actual follow and unfollow activity on public accounts. This shows you concrete changes rather than algorithmic predictions. Read our follow tracking guide for details.

For more on how Instagram's suggestion system works, including the privacy implications, see our detailed post on why someone appears in your suggestions.

The Bottom Line

Instagram suggestions are powered by a multi-signal algorithm that weighs your connections, contacts, browsing behavior, and interests. There is no single "creepy" explanation for why someone appears. The most common triggers are mutual followers and contact syncing, both of which you can control through your settings. Understanding these factors helps you manage your privacy and make sense of unexpected suggestions.