Promotion these days hits the only point of using social media. Fb, Twitter, Instagram, Pinterest, snap chat etc are social media platforms where one can put up ads and posts to promote Bitcoin.
promotions using official accounts are suggested on social media platforms if do not want to be considered spam
It is a thin line, and now the surveillance is going to be incresased. I think that facebook feels so threatened by cryptos and the loss of the ability to play with personal data that will try to kill them.