I've not liked Myspace for while now. It's just a massive forum for people to add fake friends, and gather numbers of "followers". I could name names, but won't (the sly amongst you will know).
When I go to their Myspace (I do occasionally check...) I find they're through 30,000 "followers" whereas my own band... well... a few, but a modest number, however - when you go to last.fm where REAL people go the situation is somewhat reversed... in fact I'd go so far as to say it's almost logarithmic!
last.fm gathers (with your permission) stats on who is listening to what, and how many times, and when. I subscribe to it, as do quite a few people I know, and as such you can see some of the embarrassing contents of my music collection (and I get to see theirs). It stands to reason something gathering such information is going to tell slightly more truthful figures than something just showing you web pages and grubbing "adds", after all, how …