Twitter really ought to do something about Sybil attacks. In fact, they could probably fix their monetization strategy at the same time; start charging users so

Twitter really ought to do something about Sybil attacks. In fact, they could probably fix their monetization strategy at the same time; start charging users some small fee in exchange for having their identity verified. Non verified accounts can't be retweeted or they have some caps on the number of public views they can get, or interactions they can have with accounts that don't follow them, etc. Now that I think about it, this could solve their spam and harassment problems too.