Unless they have liberal (hah...) TOS, this is straightforward breach of contract. No one pays money to post or read FB and Twitter and participation is volunt

Unless they have liberal (hah...) TOS, this is straightforward breach of contract. No one pays money to post or read FB and Twitter and participation is voluntary. But if I pay money to an ISP and the ISP decides that I can't access certain web services for what are essentially random (political) reasons with no legal justification beyond "We don't like them" - there's a good chance that's not going to end well if it gets to court.