Facebook: I'm a Fan of...

When did these start cropping up?  Noticed them yesterday, seems that someone signs a person/thing up to Facebook and you can all become a Fan.  Quite a good idea, similar to appreciation societies I guess…

So far I’ve become a Fan of Bill Bailey and Aber uni…Why?  Because they both rock and both contain beardy people…Who are, of course, the best kinda people around :P