User blog comment:VDRAGON/Who's Blackmailing Cam?/@comment-24628700-20130625140552

Grayson or Suzie. Suzie had a big part in a previous episode, and it seems that they're bringing them back (the Outcasts, as an example).... although that can also mean Irwin is the blackmailer.

But, Grayson was acting suspicious in the forest, so it's likely him.