I don't know exactly what you mean by your question. ICOs are not conducted within facebook or any other social media so how could they ban them? It was announced that facebook would ban all paid advertising for cryptocurrencies (which in turn includes ICOs) in order to protect their customers interests. This is obviously bad for crypto as it reduces the reach and exposure it can have. Facebook or Social media as a whole will never ban their customers from talking about cryptocurrencies, this goes against the whole premise of social media.