Livestream.
Get rid of this spammer.
Now.
Really, not being able to deal with a single person for months? This is inexcusable.
Do you not care? Is it not worth it to you? You think it's just guests and free members who are getting annoyed and leaving? Nobody is going to see Livestream rife with spam and bots, then move over to Ustream or Twitch? Well I hope you enjoy the ad revenue from empty channels.