[youtube=http://www.youtube.com/watch?v=lfQhdBpCFCA&hl=en&fs=1&]
Confirmed here, by the LA Times. Watch his videos here.
UPDATE: For perspective, the New York Times notes this observation from Ethan Zuckerman, a senior researcher at the Berkman Center for Internet and Society at Harvard Law School:
My twitter search script sees roughly 15% of all posts on Twitter mentioning Michael Jackson. Never saw Iran or swine flu reach over 5%
UPDATE II: TIME’s tribute to Jackson.