It appears Facebook has blocked the URL for the Facebook bounty.
Might be an error or some issue that needs to be fixed.
Then again Facebook might be censoring it, maybe lumping it in the same category as the ban on ads for crypto and ICO's.
Facebook is attempting to block all ICO's. We are staying alive there, not sure for how long, but our message is out. We are growing, with a community of 41,000+ just on our newsletter.