whats all the twitter about?

I keep hearing people talk about twitter and how its currently the fastest growing social networking site, but I didn't actually check out the site until today. In my intro to pr class a speaker came in today and showed us the site as well as explained its applications. Did you know that despite being the fastest growing social networking site twitter is currently making no revenue. This is because they don't charge a membership fee and the site has yet to devise a way to allow for advertising. Its quite ironic that a company that is estimated to be worth over a billion dollars isn't actually generating any money. Regardless twitter is really an interesting phenomena. This site grants you an all access pass to the minds of successful professionals from various fields and it presents you with the opportunity to hear breaking news before the rest of the world.