WWE (Monday Night Raw)
The June 21, 2010 after Vince McMahon removed Bret Hart from the position. Messages would be delivered via flashing lights and an instant messenger sound. Michael Cole would generally read the "e-mails" on his lap-top or iPad.
Chris Jericho claimed to be on a quest to unearth the identity of the Anonymous GM after he felt the GM had interfered with his chance at the WWE championship. This quest was halted after he was punted in the skull by Randy Orton.
After Laurinaitas was fired from both Raw and Smackdown (he had later also taken over that position from Teddy Long), a series of former GMs began hosting both shows. On July 9, 2012, the GM that returned was the Anonymous Raw GM.
Santino Marella took up Chris Jericho's quest to unearth the GM's identity, based on a rumor that the GM was in the building. He eventually reached the conclusion that the GM was not backstage, and so he must be under the ring.
The Anonymous GM denied this via e-mail, but as Santino walked up to the stage, he was pulled under the ring. As he was rescued, Hornswoggle was clutching his ankles.
After Jerry Lawler and Santino expressed their disapproval over Hornswoggle's actions, Hornswoggle attacked and defeated them both. Michael Cole, thinking Hornswoggle and ally, went to shake his hand, but he was also defeated.
It is unknown if the Anonymous Raw GM was a single individual, or a series of individuals who may have taken over the role. It seems clear that Hornswoggle was the GM on the 2012 appearance, but it may not be true that he was the GM during previous years.