Still haven't figured out what Twitter is ?good for?
http://blogoscoped.com/search/?q=Twitter [ or go directly to]
http://blogoscoped.com/forum/141976.html

Worry no more. "The Morning News" has done the figuring-out for you. Here's their version of "All You Ever Wanted to Know About Twitter, But Were Afraid You'd Be Considered A Digital Dodo Had You Asked":

"[...] Technically, this isn't an article about the things Twitter does, it's an article about the ways in which you can accidentally annoy people with Twitter. Should you choose to avoid Twitter, that's fine. Enjoy your coffee. Ours is cold now because we were photographing the latté art to share with all our friends, but you can drink yours in solitude. [...]"
http://www.themorningnews.org/archives/the_thoughtful_user_guide/writing_my_twitter_etiquette_article_14_ways_to_use_twitter_politely.php