Not an American, but if a lawyer / whatever during jury selection insist on trying to pry open one of your social accounts, couldn’t you stop them on their tracks simply citing the First Amendment (plus maybe the Fourth or whichever is “can’t be forced to give testoimony against yourself”)? Forcing someone to reveal information that might make them persecutable by the government on the grounds of the government may not like their speech sounds like literal application of the 1st here.