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I don't think so most of these coins putting up ads of ICOs and no risk cryptos are not legit and not listed on notable exchanges, Facebook is helping us by making sure noobs are not scared away from cryptocurrencies because of companies which are not operating in good faith. This creates an opportunity for noobs to research properly and invest in the legitimate coins.

The tokens were down since early the morning...I think it has more to do with the exchange news more than FB.

Their ban has to do with advertising which might not have been a big part of the ICO advertising market.