Is vanity the driving force behind last.fm?

Ugh! I just noticed that Macho Man by Village People has been in my recently played tracks list on last.fm for more than 24 hours - I won't bother trying to explain how it got there, although it just might have something to do with this. But it highlights one of the dangers of last.fm in that I can't help but be aware of what I'm listening to and how it might colour other peoples perception of me. Of course it's just vanity, nobody really cares that much - but then is vanity the driving force behind last.fm?