David Weinberger offers 4.5 Things Twitter Teaches Us, in which he makes some interesting observations about the microblogging system/current-mainstream-shiny-bauble.

His basic premise is that Twitter is a simple, extensible communications tool in which users themselves determine how best to use it.

Something that’s true about every successful web 2.0 application.

After you’ve finished with this crappy summary, go read the whole thing.