@BarelyThere you should absolutely report it. It is your account. You could approach it that it is difficult to return to Jah with this sort of harmful gossip and slander and that you would appreciate him creating a new account or changing the email address. (you can only do this once or twice on FB so if you have done it before he may have to get a new account). Stress that it is really hurtful and makes it difficult to build your faith when leaders in the congregation are engaging in such things.
I would suggest you quit looking at it regardless. Like in Pitch Perfect it's like the piece of burrito on "fat Amy''s" neck it will only fuel your hate fire...lol (gotta make light of it)