I blocked a friend by mistake, then unblocked him. I am sure he has not blocked me. After this, he remains non findable on the Facebook search engine and on messenger; so I can not connect any more with him. When I manage to find his name and picture thought the 'blocking' function and clic on it, the page is invalid. This Facebook bug is reported into various forums but no efficient solution is presented. And Facebook himself does not reply to assistance demand! Somebody can help?