The list of Luka Magnotta Youtube accounts seems to be slightly outdated, missing the last 6 months or so. Here are accounts he set up between January and May 2012 with info about what is on each one. I haven't dared to try Dailymotion and the like yet.
1. toronto19651
--opened January 13, 2012
--two Luka videos uploaded
--videos of Toronto favorited
2. r989t498
--opened January 26, 2012
--three Luka videos uploaded
--videos about Russian mafia favorited
3. 9893893t4rk
--opened January 26, 2012
--three Luka videos uploaded
--videos about Russian mafia and Russia favorited
4. t300tk9300
--opened January 26, 2012
--two Luka videos uploaded
--videos about Russian mafia favorited
5. h13k2j9kjh543
--opened February 16, 2012
--two Luka videos uploaded
6. 3r4fgouskjrh90
--opened February 16, 2012
--one Luka video uploaded
--videos about Ukraine favorited
7. r23fv989jkls
--opened February 16, 2012
--four Luka videos uploaded
--video about Serbia favorited
8. 2009384dfgw
--opened February 18, 2012
--two Luka videos uploaded
--videos about Las Vegas and snake killings favorited
9. 9000t400490
--opened February 18, 2012
--six Luka videos uploaded
--videos on Auschwitz and Stalin favorited
10. 85739453
--opened February 25, 2012
--nine Luka videos uploaded
--video on Caribbean beaches favorited
11. Mega700km
--opened February 18, 2012
--six Luka videos uploaded
--video Whigfield - Saturday Night favorited
12. 90080072
--opened March 7, 2012
--two Luka videos uploaded
--videos on Disney films favorited
13. 893894030
--opened March 7, 2012
--three Luka videos uploaded
--more videos on Disney films favorited
14. brian brian
--opened April 7, 2012
--two Luka videos uploaded
--videos from QUEER AS FOLK favorited
15. Rita VanVolkenberg
--opened April 24, 2012
--six Luka videos uploaded (including the infamous "Cannibal Serial Killer" one)
--videos from TO DIE FOR (Nicole Kidman movie) favorited
16. alexisvaloranreich
--opened May 15, 2012
--the two "1 Lunatic 1 Ice Pick Video Discussion Only" videos
--videos regarding Moors murders favorited