I was looking at this lately... I looked to see when it was logged into. Previous login was 5/25, next one was 5/29. Logged in Friday, and then Tuesday. Monday was an American federal holiday- out of office for just about everyone. This could indicate it's being handled by someone in the US- or not.
With M's distaste for communication with people in general, I can't see him doing it himself, but on the other hand, even with a busy account, it would take all of 20 minutes to approve friends and clear out messages, right?
The consensus seems to the be that he doesn't have the computer savvy to handle loading up songs and videos- but of course nothing like that has been done since Sanctuary's shutdown- or whatever is going on there.
It would make sense to assume he still has a personal assistant, one who may not be traveling with him.
Who knows?