I think your find it's more of a promotional thing rather than a social network! loads of Btn fans thow, just follow them and slowly they will follow you. Easier to stay in contact with friends on Facebook.
I have started using Twitter properly and still not really 'got it' I don't think. I've got it linked to my blog so it updates whenever I update my blog (which is frequently) but I don't tend to tweet about random musings. I do follow a fair few people but they all tend to be musicians or music related stuff. I follow that fake Gus too but it's not very funny.