The interesting thing to me is this:
Thought Streams brought me back to writing online in a way that's very seductive. TS sets the expectation that posts (cards?) can be short, maybe only a sentence, and that takes the pressure to fully develop an idea before you write it down off. And the lack of a character limit takes the pressure to be pithy off. I have enough pressure in my life, so there's no way I'm going to write online if it adds pressure.