I'm a newbie who registered just to share some information that you might be interested in. There has been a lot of discussion of Magnotta's possible YouTube posts while he was on the run. Another place where he may have posted is on DataLounge, which is a wide-ranging gay gossip and discussion forum. There was a thread on DataLounge (see link) about the case, called "Bisexual *advertiser censored* actor suspected of murder, mailing body parts." On Sunday evening (U.S. time), someone basically took over the thread and began posting dozens of creepy messages claiming that Magnotta wasn't the killer, he was framed, he was being stalked, the media was misreporting the case, etc. The posts resemble similar messages attributed to Magnotta elsewhere. The creepy posts begin with Reply 202 (Page 11 of the thread) and end with Reply 278, where the poster links to one of the HollywoodLoveLetters YouTube videos. Many people on DataLounge were creeped out and convinced that it was Magnotta himself who was posting.
DataLounge is anonymous and doesn't use user names, but if you click on the "troll-dar" link on the right side of a post, it will turn that post and all other posts from the same user (based on tracking cookies) yellow, allowing you to track who posted what.
You can check out the posts for yourselves. However, I would caution you against posting to the thread because DataLounge can be very cliquish and rude toward posts from outsiders.
http://www.datalounge.com/cgi-bin/iowa/ajax.html?t=11631297#page:showThread,11631297,1