It's interesting how different it feels from commenting on HN. The box is so tiny, and you can't edit stuff afterwards. But you also don't have to deal with replies or worry about getting downvoted if you say something unPC.<p>I'm still not sure what to use it for, to be honest.
Surprising that it took this long. PG's quotes page includes several by "Tara Ploughman", an anagram for "Not Paul Graham". When this was discovered, PG lamented the lack of a socially acceptable way to publish "single sentence essays". Twitter fills the gap nicely.
His first tweet: <a href="http://twitter.com/paulg/status/22300310058" rel="nofollow">http://twitter.com/paulg/status/22300310058</a><p>Pretty sure he meant @avibryant, not @avi.
I'd like to think I had some small hand in this: <a href="http://news.ycombinator.com/item?id=1640314" rel="nofollow">http://news.ycombinator.com/item?id=1640314</a><p>i.e. I offered the "thepaulgraham" account, since deleted.
Twitter is great to share links and short messages/news. It is not intended to be used as a conversation tool or long comments. Use it you feel the need for it, or don't.