We can only sue the government for deprivation of civil liberties under the color of law. And I'm not aware of any class action 1983 action. Ever. Multiple plaintiffs and defendants, but no class certification. We can't use 42 USC 1983 to sue Twitter UNLESS they are acting on behalf of the government. Even then, getting a court to hold that Article III standing exists would be a stretch unless we have hard evidence (emails, whatever) that Twitter, FB, and the like are de facto government entities.