I DID! I was in the library trying to outstudy a lady in a scary black trench coat and I said to myself "the best use of my time right now would be making a last.fm account" so I did.
it was a big deal, but i felt it would serve the public well for them to be able to access such gems as ABBA's 4 disc greatest hits set, tegan and sara, and the g-love and special sauce discography, which i did not know i had until right now.