When you block someone on Facebook, they lose access to your profile and can't contact you through the platform
Blocking prevents a specific person from seeing your posts, photos, and profile information. They can't message you, add you as a friend, see your comments on mutual friends' posts, or find your profile through search. The block is one-way — you won't see their activity either, but they may eventually realize they've been blocked when they try to visit your profile or search for you.
Facebook doesn't notify the blocked person that you've blocked them, but the effect becomes obvious if they try to interact with you. If they visit your profile directly (through a saved link or old message), they'll see a message saying the profile isn't available. If they search for your name, your profile won't appear in their results.
Key Takeaways
- A blocked person cannot see your profile, posts, photos, or any information you've shared, even if it was public before the block.
- They cannot message you, call you through Messenger, or add you as a friend while the block is active.
- Facebook does not send a notification to the blocked person, but they will notice if they try to contact you or visit your profile.
- You can unblock someone at any time, and doing so does not automatically restore your friendship or message history.
- Blocking is different from unfriending — unfriending lets someone still see your public posts, while blocking hides everything.
What the blocked person can and cannot see
Once you block someone, they cannot see any of your posts, even ones you marked as public before the block took effect. They won't see your profile picture, cover photo, bio, friend list, or any photos you've uploaded. If you're tagged in a photo by someone else, the blocked person still won't see that tag or the photo itself in their feed or search results.
Comments you made on mutual friends' posts become invisible to the blocked person. If you liked a public post before blocking them, that like disappears from their view. Any messages you sent before the block remain in their message history, but they cannot reply to those messages or start new conversations with you.
How blocking affects your mutual connections
Mutual friends can still see both of your profiles and activity. They won't be told that you've blocked each other. If a mutual friend tags you both in a photo or post, the blocked person won't see that content, but the mutual friend will still see it normally.
If the blocked person tries to message a mutual friend asking about you, that conversation is between them and your mutual friend — Facebook doesn't prevent that. However, if you and the blocked person were in a group chat together, they remain in that chat and can still see messages posted there, though they won't see your new messages or be able to reply to you directly.
What happens to messages and past conversations
Messages you sent before blocking remain in the blocked person's inbox, but they cannot reply to them. The conversation thread stays in their message history. If you unblock them later, those old messages reappear and they can resume replying, though the conversation will show the time gap where the block was active.
If you had a group chat with the blocked person and others, the blocked person stays in the group but cannot see messages you post to that group. Other members of the group can still see your messages. This can create confusion in group conversations, so blocking someone in an active group chat often leads to removing them from the group entirely.
The difference between blocking, unfriending, and restricting
Blocking is the strongest action — it hides everything from that person. Unfriending removes them from your friend list but allows them to still see your public posts and profile information. They can message you after unfriending, though the message goes to a separate "Message Requests" folder rather than your main inbox.
Restricting is a middle option that keeps someone on your friend list but limits what they see. Restricted people can see only your public posts and cannot see when you're online or when you've read their messages. Restricting is useful when you want to stay connected but don't want someone seeing all your activity — blocking is better when you want complete separation.
How to block and unblock someone
To block someone on Facebook, visit their profile and click the three-dot menu in the top right corner. Select "Block" from the dropdown menu. Facebook will ask you to confirm. You can also block someone from your friends list by hovering over their name and clicking the three-dot menu.
To unblock someone, go to your Settings, select "Blocking" from the left menu, and find the person's name in your blocked list. Click "Unblock" next to their name. Unblocking restores their ability to see your profile and contact you, but it does not automatically re-add them as a friend or restore any deleted messages.
What happens if you block someone you're in a relationship with on Facebook
If you list someone as your relationship status on Facebook and then block them, your relationship status remains visible to others, but the blocked person cannot see it or access your profile to confirm it. This can create awkward situations where mutual friends see the relationship status but the blocked person doesn't know about it.
If you want to remove the relationship status entirely, you should change it before or after blocking — blocking alone doesn't delete the status from your profile. The blocked person may learn about the status change through mutual friends or by asking someone else to check your profile.
Frequently Asked Questions
Can someone tell if I blocked them on Facebook?
Facebook doesn't send a notification, but they will notice if they try to visit your profile, search for you, or message you. They may also realize it if they can no longer see your posts in their feed or if mutual friends mention you in conversations they can't see.
If I block someone, do they see my old messages?
Yes, messages you sent before the block remain in their message history. They can read them but cannot reply. If you unblock them later, they can resume replying to those old messages.
What happens to photos I'm tagged in if I block someone?
The blocked person cannot see photos you're tagged in, even if they were posted by someone else. The tag becomes invisible to them, and the photo won't appear in their search results or feed.
Can I block someone without them knowing?
Yes, Facebook doesn't notify them. However, they will discover the block if they try to message you, visit your profile, or search for your name and notice you're no longer findable.
If I unblock someone, do we become friends again?
No, unblocking only removes the block. You remain unfriended unless you send them a friend request and they accept it. Your old messages reappear, but your friendship status doesn't automatically restore.