I'm still participating on facebook bounty campaign and I still didn't get ban for posting ICO in groups, pages and on my wall, I don't know the others but it's perfectly safe to post everything about ICO maybe they are doin git random or if they received a report that is the time that they will take action.
Facebook can ban those ICOs and other that seems very suspicion ICOs and is not safe for the crypto environment, but I do not see any reason by should they ban bitcoin or any other cryptocurrency ads that has to do with these, when we have seen clearly that CEO of Facebook is highly interested in crypto but wants to manipulate the own market by creating a new coin.