In this case the guy bribing people is also a regular at the only two pubs in town and getting kicked out of one of them would tank his venture because it's a source of a large portion of his audience.
Bloomberg getting kicked off of the Facebook ad platform would be a huge blow to his campaign. Facebook is huge for political campaigns because it allows them to micro target their audience and spam them with ads without any intent on the receiving end.
EDIT: Anyways, my main point is, if Facebook wanted to solve this problem they would.
If they cared about this problem to the exclusion of all else, sure. But Facebook doesn't want to ban all mention of Michael Bloomberg since Facebook users want to talk about him.
Bloomberg getting kicked off of the Facebook ad platform would be a huge blow to his campaign. Facebook is huge for political campaigns because it allows them to micro target their audience and spam them with ads without any intent on the receiving end.
EDIT: Anyways, my main point is, if Facebook wanted to solve this problem they would.