Earlier quoted context omitted.
To be absolutely fair, the italicised parts are important. There is no proof, only accusation. Edit: The article also does not prove that Facebook unblocked them (as no block was proved), nor reached out to Facebook on if they did indeed respond saying it was accidental.
Did you read the article? Facebook replied on Saturday with an apology, saying the suspension had been "accidental". That means it happened - Al Jazeera is one of the more reliable networks according to my journalist friends, and aren't usually known to publish something without fact checking or couching it in 'unconfirmed'.
Facebook also has not published any PR statement apologizing for this, so either they are not real news agencies to begin with, or this never happened, or both.
Al Jazeera is reliable except when it comes to issues like this, they suffer from a bias from having this done to them in the past as well.