There's no double morality - the balance of "who decides what can be said" is mostly taken away from government and given to the people.
It's legal for Facebook to say what it wants, and it's legal for Facebook to never say anything that it doesn't want to be said.
It's legal to make your own Facebook with nipples, four-letter words, blackjack and hookers; and it's legal for Facebook to forbid any posts containing letter x if they so choose.
> It's legal to make your own Facebook with nipples, four-letter words, blackjack and hookers;
AFAIK it's not - youth protection regulation gone wild is enshrined in law at least for TV stations and I'm sure that if FB wouldn't fear angry mothers with "uuuuuh buuuh my 16-year-old-boy saw a naked boob on FB" they wouldn't give a damn about boobs.
It's legal for Facebook to say what it wants, and it's legal for Facebook to never say anything that it doesn't want to be said.
It's legal to make your own Facebook with nipples, four-letter words, blackjack and hookers; and it's legal for Facebook to forbid any posts containing letter x if they so choose.