Can someone tell if you block them on facebook?

General
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I want to block someone on Facebook but I don’t want them to know that I blocked them. Anyone know what happens from the other person’s POV when you block them? Is it easy for the person to see that they’ve been blocked? Thanks in advance.

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When you block another user on FB, you basically disappear for that person. Facebook makes it so you essentially never existed.

You wont show up in search, you wont show up on your mutuals friends list. You wont even show up if the person is reading a comment thread that you’ve made a comment in, you nor your comment will even show up in that comment thread. They also wont see old conversions you may have had in messenger.

It’s literally as-if you never existed. Once you block that person on FB, you and your memory are ghosted from that individual. Facebook actually has one of the best, if not THE best, blocking system IMO.

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people cant tell when you block them on FB. when you block someone on FB they can’t see anything about your account at all.

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Actually, while it’s true that Facebook’s notification service doesn’t trigger an alert, the “block” state is technically discernible through specific API behaviors and UI changes on the client side.

From a technical standpoint, a block creates a unique visibility condition in the social graph. Here is how a user can deduce they have been blocked rather than the account simply being deactivated:

  1. Graph Visibility: If they try to navigate to your profile URL directly, the server returns a content unavailable error. However, the key differentiator is verifying this against a public session. If the URL returns a 200 OK status and renders the profile when accessed via an Incognito/Private window (logged out), but returns an error when logged in, that is a confirmed block.

  2. Messenger Protocol: Existing chat logs usually persist, but the input field is often disabled or replaced with a “You cannot reply to this conversation” message. If the account were merely deactivated, the name would typically change to “Facebook User” and the profile image would revert to the default placeholder, whereas a block often keeps the cached name/image visible in the inbox list but makes the profile link unclickable.

  3. Mutual Invisibility: Blocking breaks the connection bi-directionally. If they cannot tag you, invite you to groups, or see your comments on mutual friends’ posts, these are aggregate indicators of a block restriction applied to their specific User ID.

So, while there is no user_blocked event sent to their client, the absence of data where data should exist allows them to confirm it with high certainty.

Now then, all that being said, how many people do you have on your FB friends list that will go through all that just to determine if you’ve blocked them? Or, a better way to frame that question is actually “WHO on your friends list has the KNOW-HOW to even do this?”. The answer for most of people is likely nobody. So I wouldn’t worry too much about it.

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I just went ahead and blocked their account, got sick of worrying about it. I don’t think she noticed, I never heard anything about it. No calls, no txts, no he said she said, nothing. So far so good.

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You probably arent as important to her as you thought :rofl: