Seth, (9th comment)
Twitter appears to be more democratic than regular blogging -- the chance of a random person to be heard seems better.
I found it hard to believe that not long after I joined I got an invitation to go on a radio talk show to talk about craigslist. And, no... I didn't do it but my ideas made it on the show -- a lot more than I could say for having previously blogged about craigslist for years.
But I agree that these sort of things should not be commercial enterprises (the real assets are the people who actually built the following and they are the ones getting sold).