Hogart is.
Mr Popo
Lynch or Radcircles
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But, during the season finale, all the clues point to Cameron. So, I don't think it is clear on who RadCircles is, because it can still be anyone. :) Hope this helped
Radcircles is Lynch. The episode aired today. Lee goes into Lynches house and sees the voice synthesiser, a picture of his shadow and a lot of KNOCK KNOCK posters stuck to the walls
[Spoilers] Radcircles who turns out to be Lynch (CEO of Green Apple Splat co, The Tag along from the episode of that name.) Lynch was also working with Cassandra (Kimmie's mum, is incharge of many many things)