There's a lot of talk this weekend about Facebook "jumping the shark" with this ubiquitous "25 Random Things You Don't Know About Me" meme. I don't think I've ever actually participated in one of these memes, and frankly at this point I hardly notice them even when they do pass my screen. Facebook will survive this; the thing that will kill Facebook is an even more flexible social networking portal that's so elite right now none of us even know about it.

Cities, in other words, are the ultimate expression of our humanity, the ultimate habitat in which to be ourselves (which may explain why half the planet’s population currently lives in them). And in their present American incarnations—safe, family-friendly, pulsing with life on the street—they’re working at their optimum peak. In Cacioppo’s data, today’s city dwellers consistently rate as less lonely than their country cousins. “There’s a new sense of community in cities, an increase in social capital, an increase in trust,” he says. “It all leads to less alienation.”

New York, like the Internet, is a place where people live alone but are not lonely.

No one disputes the value of a good marriage, of course. Andrew Oswald, an economist at the University of Warwick, in fact tried to calculate that value, based on tens of thousands of happiness surveys collected here and in the U.K., and found that it’s worth $100,000—or roughly doubling your salary, because working Americans earn, on average, $46,996 per year. But you know what else was worth $100,000? A large circle of friends. And it turns out that Aristotle was right when he wrote in The Nicomachean Ethics that friends are the glue that binds cities together. In study after study, urban dwellers have a more substantial social network. In his 1982 classic about Californians, To Dwell Among Friends: Personal Networks in Town and City, the Berkeley, California–based sociologist Claude Fischer found a 40 percent uptick in the size of friendship-based social networks moving from semi-rural areas into the urban core. Even the recent study that found we had fewer confidants found better news for city dwellers. “Based on what I’m seeing,” says Matthew Brashears, one of the authors of the survey, “networks in large communities may have gotten smaller, but people in large communities still appear to have bigger networks than people in small.”

“In our data,” adds Lisa Berkman, the Harvard epidemiologist who discovered the importance of social networks to heart patients, “friends substitute perfectly well for family.” This finding is important. It may be true that marriage prolongs life. But so, in Berkman’s view, does friendship—and considering how important friendship is to New Yorkers (home of Friends, after all), where so many of us live on our own, this finding is blissfully reassuring. In fact, Berkman has consistently found that living alone poses no health risk, whether she’s looking at 20,000 gas and electricity workers in France or a random sample of almost 7,000 men and women in Alameda, California, so long as her subjects have intimate ties of some kind as well as a variety of weaker ones. Those who are married but don’t have any civic ties or close friends or relatives, for instance, face greater health risks than those who live alone but have lots of friends and regularly volunteer at the local soup kitchen. “Any one connection doesn’t really protect you,” she says. “You need relationships that provide love and intimacy and you need relationships that help you feel like you’re participating in society in some way.”

At 28½, I'm just old enough to look down on Mark Bauerlein's "Dumbest Generation."

The way Bauerlein sees it, something new and disastrous has happened to America's youth with the arrival of the instant gratification go-go-go digital age. The result is, essentially, a collective loss of context and history, a neglect of "enduring ideas and conflicts." Survey after painstakingly recounted survey reveals what most of us already suspect: that America's youth know virtually nothing about history and politics. And no wonder. They have developed a "brazen disregard of books and reading."

Things were not supposed to be this way. After all, "never have the opportunities for education, learning, political action, and cultural activity been greater," writes Bauerlein, a former director of Research and Analysis at the National Endowment for the Arts. But somehow, he contends, the much-ballyhooed advances of this brave new world have not only failed to materialize -- they've actually made us dumber.

The problem is that instead of using the Web to learn about the wide world, young people instead mostly use it to gossip about each other and follow pop culture, relentlessly keeping up with the ever-shifting lingua franca of being cool in school. The two most popular websites by far among students are Facebook and MySpace. "Social life is a powerful temptation," Bauerlein explains, "and most teenagers feel the pain of missing out."

This ceaseless pipeline of peer-to-peer activity is worrisome, he argues, not only because it crowds out the more serious stuff but also because it strengthens what he calls the "pull of immaturity." Instead of connecting them with parents, teachers and other adult figures, "[t]he web . . . encourages more horizontal modeling, more raillery and mimicry of people the same age." When Bauerlein tells an audience of college students, "You are six times more likely to know who the latest American Idol is than you are to know who the speaker of the U.S. House is," a voice in the crowd tells him: "'American Idol' IS more important."

Better pretend my last post wasn't about comic books.

Cory Doctorow explains how Facebook will collapse, like Friendster and MySpace before it, under the crushing weight of too many friends.

For every long-lost chum who reaches out to me on Facebook, there's a guy who beat me up on a weekly basis through the whole seventh grade but now wants to be my buddy; or the crazy person who was fun in college but is now kind of sad; or the creepy ex-co-worker who I'd cross the street to avoid but who now wants to know, "Am I your friend?" yes or no, this instant, please.

It's not just Facebook and it's not just me. Every "social networking service" has had this problem and every user I've spoken to has been frustrated by it. I think that's why these services are so volatile: why we're so willing to flee from Friendster and into MySpace's loving arms; from MySpace to Facebook. It's socially awkward to refuse to add someone to your friends list -- but removing someone from your friend-list is practically a declaration of war. The least-awkward way to get back to a friends list with nothing but friends on it is to reboot: create a new identity on a new system and send out some invites (of course, chances are at least one of those invites will go to someone who'll groan and wonder why we're dumb enough to think that we're pals).

That's why I don't worry about Facebook taking over the net. As more users flock to it, the chances that the person who precipitates your exodus will find you increases. Once that happens, poof, away you go -- and Facebook joins SixDegrees, Friendster and their pals on the scrapheap of net.history.