If sharing information is the point of social networks then Twitter is the stingiest of the bunch. Perhaps thats why celebrities and corporations like it so much.
I have strong doubts about the long term future of Twitter in its current form.

Though it is still receiving rounds of venture capital funding it hasn’t made a single dime making any money right now nor has it announced any business plans. I fear that once the venture capitalists realize there isn’t a business plan at all they will pull their money out. Twitter’s popularity will ultimately be its downfall as bandwidth and server costs will quickly swallow their remaining funds.

For most people there isn’t much of a reason for anyone else to read your tweets unless you are a content producer of some kind. Face it, nobody but close family is interested in what you just ate or that you are at home petting your dog. You would be better served by sending a text message on your phone to your friends or use a service like Facebook instead (which most of your friends probably are using anyway).

Those who think they are getting closer to celebrity Twitterer need to realize that, like television, it is a one way street, a cheap communication channel for them to reach (advertise) to their fans. Just don’t expect much. Most of the big name Twitter users simply aren’t listening to your tweets. Unless you have a number of friends who use the service you are likely writing short messages into a black hole.