I have a blackberry pearl. I want to follow a few people on twitter and have the tweets sent to my blackberry. I did the verify thing, and have "my phone is active" or whatever it is clicked in my profile, but nothing ever comes through. Am I missing something obvious here?

What is the benefits-costs balance of creating and keeping a Twitter profile? I already have a Facebook profile and feel it is taking up a huge part of my time and more commitment and investment than I would have liked to give it. But at the same time I am curiousr about all the interest in Twitter and tweets and wonder whether I am missing something good!