Question: How to Block Someone on Facebook Messenger Android?

Can you block someone on messenger without them knowing?

Note: Blocking messages from someone is different from blocking them on Facebook.

If you block messages from someone, but you don’t block them on Facebook, you’ll still be able to see their Facebook profile.

You’ll also no longer be able to contact them in Messenger or in Facebook chat.

Can someone tell if you block them on messenger?

If their profile appears normal, then they have blocked your messages. If you cannot find their profile but your mutual friends can see that, unfortunately your entire Facebook account has been blocked.