Consent is implicitly given when you are in public. That's what "public" means, legally. It's a place where there is no expectation of privacy, which by moving

Consent is implicitly given when you are in public. That's what "public" means, legally. It's a place where there is no expectation of privacy, which by moving into willingly, you are giving up any expectations of privacy willingly. By conducting yourself in public, you are consenting to the loss of privacy. Twitter should be fine if they're operating under local definitions of legal consent. If they're going to roll their own, things could get legally ugly - paparazzi could have legitimate claims of discrimination and financial damages.