And after all this, Twitter still does not have a viable business model.
...more pertinently, App.net didn't have one either - and they had an open API, charged real money and did all the things HNers' idealized version of Twitter would.
Either:
It is cool. So we must use it.
Or:
Everyone else is using it so we must use it too.
Seriously:
140 characters? Feature?
Everyone can read everything? Feature?
The two biggest technical "features" of twitter can be arrived at by dumbing down either google+ or facebook 98%.
1. It's where the people are. I don't think anyone is 100% loyal to it, but you have to respect its reach.
2. Instant answers. I can get insight on news via Twitter well before I can get it anywhere else. On top of that, I can get it from the people I want, many of whom are Tweeting hours before they are able to get an article published. This is great for sports, politics, etc.
I personally don't use Twitter nearly as often as I once did, and I rarely find reason to Tweet, but I do enjoy browsing it from time to time.