For some reason not explained by Facebook, this text doesn’t appear at the bottom of all deactivated accounts.
Sometimes, but not always, a deactivated account’s name will be replaced with “Facebook User” instead of the name you’re used to. This may happen if Facebook has deleted the person’s account for violations, or if the person has deleted their own account permanently. If someone deactivates their Facebook account, they can reactivate it at any time.
If you can see the person’s profile as normal, you are not blocked on Facebook, and their account is active. It is still possible that they’ve blocked you on Messenger but not on Facebook. If you see “This Content Isn’t Available Right Now” (or similar) instead of their profile, and their profile photo in Messenger was a gray placeholder icon, they haven’t blocked you—they’ve deactivated their account (or it was deleted by Facebook). But, if the person’s profile photo and name are visible at the top of the chat and you see “This Content Isn’t Available Right Now” on their Facebook profile, this person blocked you on Facebook, which means you’re also blocked on Messenger. You can double-check by looking for their name in your Friends list—if it’s no longer there, and you can’t search for the person, you’re blocked on both Facebook and Facebook Messenger. [2] X Research source
Even if you’re blocked, you’ll still see the conversation with the person in Messenger.
If you see a red exclamation point icon instead of the checkmark icon (or you see “Not Everyone can message this account”), the person’s account may have been terminated by Facebook or their messaging is restricted due to complaints. It doesn’t mean they’ve blocked you.
If the person has logged in to Facebook on a computer or opened Messenger on their phone or tablet but has not opened your message, the circle around the checkmark will fill with a solid color. When the person does open your message, the checkmark will be replaced by the person’s profile photo. If the person never received or opened the message, the original Sent icon—the hollow circle with a checkmark inside—will still be there. If the icon hasn’t changed and you know the person has been on Facebook or Messenger, they’ve probably blocked you.
