I am not very impressed by this rule. And I don't think it will last. They may change their minds in just a few months. Or never really enforce it even.
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Facebook a social network website that helps promote one product or service but they banned all advertising for cryptocurrencies because they don't want to be correlated with misleading or deceptive promotional practices. Facebook also trying to protect also the users and they want to maintain the trust and confidence of the public.