What are the advantages and the disadvantages of starting a Twitter account?

Question From User - Answers in Comments.

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!