There is so large scale adult social media.
Adult social media is sort of an oxymoron and few adults would want their participation openly known outside of various adult media -- 'stigmatization' Google that word if you are unfamiliar with it :P
This may be one reason that there is no large scale ''porn social media.''
People operate anonymously in Twitter for this reason. Not operating anonymously, as Facebook requires limits stalking and other unlawful or unwanted activities -- so this anonymity is a double edged sword.
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