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I don't agree that your concern applies. Twitter is an opt-in system so users that abuse their lists will die when people get annoyed and unsubscribe.

• sant0sk1 18y ago
  Correct me if I'm wrong, but can't you @ message somebody even if they aren't following you? He is not referring to a general $$ tweet, but to an @ $$ tweet.
  • j2d2 18y ago
    Sure, but that's easy enough to solve if revenue is at stake.