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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 ESP," as Haley described it to me, an invisible dimension floating over everyday life.

ad hoc, self-organizing socializing.

The Japanese sociologist Mizuko Ito first noticed it with mobile phones: lovers who were working in different cities would send text messages back and forth all night

You could also regard the growing popularity of online awareness as a reaction to social isolation, the modern American disconnectedness that Robert Putnam explored in his book "Bowling Alone."

"Things like Twitter have actually given me a much bigger social circle. I know more about more people than ever before."

Online awareness inevitably leads to a curious question: What sort of relationships are these? What does it mean to have hundreds of "friends" on Facebook? What kind of friends are they, anyway?

Dunbar noticed that ape groups tended to top out at 55 members. Since human brains were proportionally bigger, Dunbar figured that our maximum number of social connections would be similarly larger: about 150 on average

where their sociality had truly exploded was in their "weak ties"

"I outsource my entire life," she said. "I can solve any problem on Twitter in six minutes."

She also keeps a secondary Twitter account that is private and only for a much smaller circle of close friends and family — "My little secret," she said. It is a strategy many people told me they used: one account for their weak ties, one for their deeper relationships.)

Psychologists have long known that people can engage in "parasocial" relationships with fictional characters, like those on TV shows or in books, or with remote celebrities we read about in magazines. Parasocial relationships can use up some of the emotional space in our Dunbar number, crowding out real-life people.

Danah Boyd, a fellow at Harvard's Berkman Center for Internet and Society who has studied social media for 10 years, published a paper this spring arguing that awareness tools like News Feed might be creating a whole new class of relationships that are nearly parasocial — peripheral people in our network whose intimate details we follow closely online, even while they, like Angelina Jolie, are basically unaware we exist.

"These technologies allow you to be much more broadly friendly, but you just spread yourself much more thinly over many more people."

She needs to stay on Facebook just to monitor what's being said about her. This is a common complaint I heard, particularly from people in their 20s who were in college when Facebook appeared and have never lived as adults without online awareness. For them, participation isn't optional. If you don't dive in, other people will define who you are.

"It's just like living in a village, where it's actually hard to lie because everybody knows the truth already," Tufekci said. "The current generation is never unconnected. They're never losing touch with their friends. So we're going back to a more normal place, historically. If you look at human history, the idea that you would drift through life, going from new relation to new relation, that's very new. It's just the 20th century."

Psychologists and sociologists spent years wondering how humanity would adjust to the anonymity of life in the city, the wrenching upheavals of mobile immigrant labor — a world of lonely people ripped from their social ties. We now have precisely the opposite problem. Indeed, our modern awareness tools reverse the original conceit of the Internet. When cyberspace came along in the early '90s, it was celebrated as a place where you could reinvent your identity — become someone new.

"If anything, it's identity-constraining now," Tufekci told me. "You can't play with your identity if your audience is always checking up on you.

"You know that old cartoon? 'On the Internet, nobody knows you're a dog'? On the Internet today, everybody knows you're a dog! If you don't want people to know you're a dog, you'd better stay away from a keyboard."

Young people today are already developing an attitude toward their privacy that is simultaneously vigilant and laissez-faire. They curate their online personas as carefully as possible, knowing that everyone is watching — but they have also learned to shrug and accept the limits of what they can control.

Many of the avid Twitterers, Flickrers and Facebook users I interviewed described an unexpected side-effect of constant self-disclosure. The act of stopping several times a day to observe what you're feeling or thinking can become, after weeks and weeks, a sort of philosophical act. It's like the Greek dictum to "know thyself," or the therapeutic concept of mindfulness.

Mobility, like frequent re-potting of plants, tends to disrupt root systems, and it takes time for an uprooted individual to put down new roots. It seems plausible that the automobile, suburbanization, and the movement to the Sun Belt have reduced the social rootedness of the average American,

It seems highly plausible that this social revolution should have reduced the time and energy available for building social capital.

These new mass-membership organizations are plainly of great political importance.

the only act of membership consists in writing a check for dues or perhaps occasionally reading a newsletter.

tertiary associations

Although most of you call these sites "social networking sites," there's almost no networking going on. People use these sites to connect to the people they know.

1) Social stratification is pervasive in American society (and around the globe). Social media does not magically eradicate inequality. Rather, it mirrors what is happening in everyday life and makes social divisions visible. What we see online is not the property of these specific sites, but the pattern of adoption and development that emerged as people embraced them. People brought their biases with them to these sites and they got baked in. 2) There is no universal public online. What we see as user "choice" in social media often has to do with structural forces like homophily in people's social networks. Social stratification in this country is not cleanly linked to race or education or socio-economic factors, although all are certainly present. More than anything, social stratification is a social networks issue. People connect to people who think like them and they think like the people with whom they are connected. The digital publics that unfold highlight and reinforce structural divisions.

3) If you are trying to connect with the public, where you go online matters. If you choose to make Facebook your platform for civic activity, you are implicitly suggesting that a specific class of people is more worth your time and attention than others. Of course, splitting your attention can also be costly and doesn't necessarily mean that you'll be reaching everyone anyhow. You're damned if you do and damned if you don't. The key to developing a social media strategy is to understand who you're reaching and who you're not and make certain that your perspective is accounting for said choices. Understand your biases and work to counter them. 4) The Internet has enabled many new voices to enter the political fray, but not everyone is sitting at the table. There's a terrible tendency in this country, and especially among politically minded folks, to interpret an advancement as a solution. We have not eradicated racism. We have not eradicated sexism. We have not eradicated inequality. While we've made tremendous strides in certain battles, the war is not over. The worst thing we can do is to walk away and congratulate ourselves for all of the good things that have happened. Such attitudes create new breeding grounds for increased stratification.

empowering a new generation of largely unregulated political warriors who can affect the campaign dialogue faster and with more impact than the traditional opposition research shops.

Dan Carol, a strategist for Mr. Obama who was one of the young bulls on Bill Clinton’s vaunted rapid response team in 1992. “There’s just a lot of people who at a very low cost can do this stuff and don’t need a memo from HQ.”

But as is often the case with such videos, how many of the viewers come to sneer rather than applaud is hard to tell.