Indeed some time ago facebook has made a decision to ban ICO ads and crypto currency ads. I think it's not fair, as a social media then facebook should give freedom to its users to perform their activities as long as it does not violate the policies and laws of the country. I gave feedback to facebook to consider the decision. If facebook really prohibits ICO ads and crypto currency ads then facebook will lose millions of users because all players crypto currency using facebook as one of the promotional media. However, I have heard lately that facebook has changed its decision and now facebook gives permission for crypto currency and ICO advertising. Hopefully, we will be more open with the presence of technology and view every technology as a positive work.