Facebook only ban advertising about ICOs. Its happen because many report about scam ICOs and company like facebook and google decide to ban advertising about ICOs to prevent people get scammed. I think it give no effect on crypto market
Really it will effect the price growth of the crypto currencies and will late more time if there is no advertisements in social medias and still it is not cleat that what kind of ban was implemented on facebook because individuals are also can't do more posts if they do then their account will be disabled.