Interesting points on Twitter. I don't have anywhere near that # of followers, but yeah, for a lot of famous/well-known people that I do follow, they do appear to work on a broadcast model.

I did on LJ, but I didn't use them much. On the other hand, I'd say a lot of the time I was working out of a broadcast model anyway.

Hmm, so since feedback was harder and lurkers had a harder time speaking, the illusion of obscurity could be much better maintained. Yeah, with the internet having grown exponentially over the past ten years, it would in fact be odd if social norms/mores had not changed.