Twitter, in brief, is "microblogging."
Why should you use it? Maybe you shouldn't. But you should go to twitter and poke around...lots and lots of companies use it to give their customers information, individuals use it to keep their friends and family in touch, communities are using it to keep constituents abreast of local events (like the reach of forest fires or police incidents), etc...there's a lot more to it than meets the eye.
I just wrote a proposal on using social media for industry and business research and Twitter is one the sources included (if my proposal gets accepted.)
"And all our fears were in vain, a dream, just like the Lord said."- Jack Kerouac, Desolation AngelsYeah, I have a blog....