Most people do not realize this, but Twitter is a fantastic marketing and information tool. Many news sites (CNN, MSNBC, etc.) have Twitter feeds that can be followed to get quick bits of news, as well as following companies like Antec or Razer for knowing what new products are coming up and such. You can also follow celebs to know the latest gossip or whatever celebs do. Along with all this and the usual socializing aspect of it and you have yourself a one-stop shop for all kinds of information.
Twitter isn't just telling people what you had for breakfast....