From this Sunday's New York Times, a good piece by Clive Thompson on microblogging, ambient awareness, and what it means.

Ben Haley, a 39-year-old documentation specialist for a software firm who lives in Seattle, told me that when he first heard about Twitter last year from an early-adopter friend who used it, his first reaction was that it seemed silly. But a few of his friends decided to give it a try, and they urged him to sign up, too.

Each day, Haley logged on to his account, and his friends’ updates would appear as a long page of one- or two-line notes. He would check and recheck the account several times a day, or even several times an hour. The updates were indeed pretty banal. One friend would post about starting to feel sick; one posted random thoughts like “I really hate it when people clip their nails on the bus"; another Twittered whenever she made a sandwich — and she made a sandwich every day. Each so-called tweet was so brief as to be virtually meaningless.

But as the days went by, something changed. Haley discovered that he was beginning to sense the rhythms of his friends’ lives in a way he never had before. When one friend got sick with a virulent fever, he could tell by her Twitter updates when she was getting worse and the instant she finally turned the corner. He could see when friends were heading into hellish days at work or when they’d scored a big success. Even the daily catalog of sandwiches became oddly mesmerizing, a sort of metronomic click that he grew accustomed to seeing pop up in the middle of each day.

This is the paradox of ambient awareness. Each little update — each individual bit of social information — is insignificant on its own, even supremely mundane. But taken together, over time, the little snippets coalesce into a surprisingly sophisticated portrait of your friends’ and family members’ lives, like thousands of dots making a pointillist painting. This was never before possible, because in the real world, no friend would bother to call you up and detail the sandwiches she was eating. The ambient information becomes like “a type of E.S.P.,” as Haley described it to me, an invisible dimension floating over everyday life….

Social scientists have a name for this sort of incessant online contact. They call it “ambient awareness.” It is, they say, very much like being physically near someone and picking up on his mood through the little things he does — body language, sighs, stray comments — out of the corner of your eye.

Also the obligatory quotes from Mimi Ito, Marc Davis, mention of Dunbar numbers, collective intelligence, etc., etc.. All good.