I have a few sites, and while my older sites are not blocked, the new ones are... I was given a message that they violate Facebook policy, but they don't.  I messaged them and the response I was given is that they will use the feedback in consideration for future issues, but not my current issue... F'n Crazy! I think they have a new algorithm that blocking sites that re-direct people to outside social networks that don't solely rely facebook.   Especially if the site has ads on it.