You can easily unblock someone on Facebook Messenger in the "People" preferences section of the app. Here's how to do it.

It's hard to know if you've been blocked on Messenger, but there are signs you can look out for on both mobile and desktop.

I walk through how I use Facebook Messenger on my iPhone to chat with friends, send photos, and manage settings. I show how to send new messages, create group chats, and share pictures or voice ...