Ladies & Gentlemen, Jessica Livingston is on Twitter (PG beware)
twitter.com
twitter.com
Contrast that with pgs follows, which were uncalculated, and revealed the rough order in which he thought of people as being "interesting". Sam Altman was one of his first follows, in spite of being a very boring twitterer (I think he just checks in with loopt on twitter).
The high up joshu follow, ahead of trevor blackwell, for example, would imply that they do speak outside of at meet-ups.
http://en.wikipedia.org/wiki/Jessica_Livingston
Oh, okay.
Welcome to twitter!