Facebook and Instagram bans Cryptocurrencies ads. I think they are nothing to cryptocurrencies. Facebook users are not great market. It is only few percent of ICO market. I think cryptocurrencies will not die because of them.
They are not "nothing" it's still a loss for potential investors even if less people are just joining cryptocurrencies because of facebook it's still investors and money is money. But I do agree that crypto currencies will not die because of facebook blocking ads from ICOs and Cryptocurrencies. There are still many social media ready to use for sharing ICOs and cryptocurrencies like blogs, youtube, twitter, telegram etc.