Blocking removes their access to your profile, but it's not invisible to them
When you block someone on Facebook, they can no longer see your profile, posts, photos, or any content you share — past or future. They cannot message you, add you as a friend, or see you in their search results. If you were already friends, that friendship ends immediately.
The block is not secret, though. The person will eventually notice they cannot find your profile or that a previous friendship has disappeared. Facebook does not send them a notification saying "you've been blocked," but the effect becomes obvious if they try to visit your page or search for you.
Blocking is different from unfriending. When you unfriend someone, they can still see your public posts and your profile (unless you've restricted it), but you're no longer connected. A block is more complete — it hides everything.
Key Takeaways
- Blocked people cannot see your profile, posts, photos, messages, or friend list, and cannot send you friend requests or messages.
- The block is not announced by Facebook, but becomes obvious to the blocked person if they search for you or try to visit your profile.
- You can unblock someone at any time from your settings, and blocking does not delete past conversations from your own account.
- Blocking someone on Facebook does not block them on Instagram or Messenger unless you block them separately on those platforms.
- If you block someone who is in a group with you, they can still see the group and its posts, but cannot see your comments or posts within it.
How to block someone on Facebook
Open the person's profile or find them in a conversation. On their profile, tap the three dots in the top right corner (on mobile) or hover over the "Friends" button (on desktop), then select "Block." On Messenger, open the conversation, tap their name at the top, scroll down, and tap "Block."
Facebook will ask you to confirm. You can choose whether to also block them on Instagram if you have a linked account. After you confirm, the block takes effect immediately.
What the blocked person can and cannot do
A blocked person cannot find your profile through search, cannot see any of your posts or photos, cannot view your friend list, and cannot see your comments on mutual friends' posts. If you comment on a public post in a group or on a public page, they still cannot see that comment.
They cannot send you a message on Messenger, cannot add you as a friend, and cannot tag you in photos or posts. If they try to visit your profile directly (by typing your name in the URL, for example), they will see a message saying the profile is not available.
One important exception: if you are both members of a Facebook group, the blocked person can still see the group, its posts, and comments from other members. They simply cannot see your individual posts or comments within that group.
What happens to your past conversations
Blocking does not delete your message history. You can still see all past conversations with the blocked person in your Messenger inbox. You can read old messages, but you cannot send new ones or receive replies.
The blocked person's view is different. They can still see the conversation thread on their end, but any new messages you send will not go through. If they try to message you, they will not receive a delivery confirmation, and the message may appear to send but will not reach you.
Unblocking and what happens next
You can unblock someone at any time. Go to Settings, select "Blocking" from the left menu, find the person's name in your blocked list, and click "Unblock." Unblocking does not automatically re-add you as friends — you will both need to send friend requests again if you want to reconnect.
After you unblock someone, they can see your profile again and search for you. They will not receive a notification that you unblocked them, but they may notice your profile is suddenly visible again if they search for you.
Blocking on Facebook versus Instagram and Messenger
Blocking someone on Facebook does not automatically block them on Instagram or Messenger. These are separate platforms with separate block lists, even though Facebook owns all three. If you want to block someone across all three, you need to block them individually on each one.
If you block someone on Instagram, Facebook will offer to block them on Facebook too, but you have to confirm. The reverse is not automatic — blocking on Facebook does not trigger an Instagram block prompt.
When blocking might not be enough
Blocking prevents someone from seeing your profile and contacting you through Facebook's official channels. However, if someone is determined to contact you, they could create a new account and message you from that account, or contact you through another platform entirely.
If someone is harassing you, blocking is a good first step, but Facebook also has reporting tools. You can report a person for harassment, threats, or abuse, and Facebook's safety team will review the report. Reporting does not notify the person, but it creates a record if the behavior continues.
If you are experiencing ongoing harassment or threats, consider reporting to Facebook and, if necessary, to local law enforcement. Screenshots of messages or posts can serve as evidence.
Frequently Asked Questions
Can someone tell if I blocked them?
Facebook does not send a notification, but they will notice if they try to find your profile or visit it directly. They may see a message saying your profile is not available, or they may simply notice you no longer appear in search results. If you were friends, they will see that friendship has ended.
If I block someone, can they still see my posts on mutual friends' profiles?
No. If you comment on a mutual friend's post, the blocked person cannot see your comment. However, if you post on a public page or in a public group, and the blocked person is also a member of that group, they cannot see your posts there either.
What if I block someone by accident?
You can unblock them immediately. Go to Settings, select "Blocking," find their name, and click "Unblock." They will not be notified, and you will not be re-added as friends automatically — you will need to send a friend request again.
Does blocking someone delete our chat history?
No. You can still see all past messages in your Messenger inbox. The blocked person can also still see the conversation on their end, but neither of you can send new messages to each other.
If I block someone on Facebook, are they blocked on WhatsApp too?
No. Facebook, Instagram, Messenger, and WhatsApp are separate platforms with separate block lists. Blocking on one does not affect the others. You would need to block them separately on WhatsApp if you want to prevent them from contacting you there.