You can tell if someone block you on Facebook:
Type in their name and see if the profile comes up – If you don’t find them but other users with matching names show, you may have been blocked.
Access their profile link – if you find that “Content not available,” it might be a sign that you have been blocked.
Look through your old messages – If you see “Facebook User” instead of their name, they may have blocked or deactivated.
Have a friend look up the profile – If they can find it and you still can’t, it’s most likely you’re blocked.
If someone is deactivated, it may look like they have been blocked.