When I first created an account on Twitter I really wasn't sold on its usefulness. It seemed silly and irrelevant and a waste of time mainly because I hadn't taken the time to learn how to use it to its full potential. Nowadays, I learn so much from the people I follow on Twitter. They are the great thinkers in Libraryland and gurus of Technology Education who share their insight and knowledge with others freely. I highly recommend you create a Twitter account. I think you will be amazed.
Here is one tip to make Twitter useful:
Find people or groups to follow by searching InboxQ for topics related to your field or subject.