The question has intensified in the Facebook era. A recent study out of Australia (where close to half the population is active on Facebook), titled “Who Uses Facebook?,” found a complex and sometimes confounding relationship between loneliness and social networking. Facebook users had slightly lower levels of “social loneliness”—the sense of not feeling bonded with friends—but “significantly higher levels of family loneliness”—the sense of not feeling bonded with family. It may be that Facebook encourages more contact with people outside of our household, at the expense of our family relationships—or it may be that people who have unhappy family relationships in the first place seek companionship through other means, including Facebook. The researchers also found that lonely people are inclined to spend more time on Facebook: “One of the most noteworthy findings,” they wrote, “was the tendency for neurotic and lonely individuals to spend greater amounts of time on Facebook per day than non-lonely individuals.” And they found that neurotics are more likely to prefer to use the wall, while extroverts tend to use chat features in addition to the wall.

Moira Burke, until recently a graduate student at the Human-Computer Institute at Carnegie Mellon, used to run a longitudinal study of 1,200 Facebook users. That study, which is ongoing, is one of the first to step outside the realm of self-selected college students and examine the effects of Facebook on a broader population, over time. She concludes that the effect of Facebook depends on what you bring to it. Just as your mother said: you get out only what you put in. If you use Facebook to communicate directly with other individuals—by using the “like” button, commenting on friends’ posts, and so on—it can increase your social capital. Personalized messages, or what Burke calls “composed communication,” are more satisfying than “one-click communication”—the lazy click of a like. “People who received composed communication became less lonely, while people who received one-click communication experienced no change in loneliness,” Burke tells me. So, you should inform your friend in writing how charming her son looks with Harry Potter cake smeared all over his face, and how interesting her sepia-toned photograph of that tree-framed bit of skyline is, and how cool it is that she’s at whatever concert she happens to be at. That’s what we all want to hear. Even better than sending a private Facebook message is the semi-public conversation, the kind of back-and-forth in which you half ignore the other people who may be listening in. “People whose friends write to them semi-publicly on Facebook experience decreases in loneliness,” Burke says.

On the other hand, non-personalized use of Facebook—scanning your friends’ status updates and updating the world on your own activities via your wall, or what Burke calls “passive consumption” and “broadcasting”—correlates to feelings of disconnectedness. It’s a lonely business, wandering the labyrinths of our friends’ and pseudo-friends’ projected identities, trying to figure out what part of ourselves we ought to project, who will listen, and what they will hear. According to Burke, passive consumption of Facebook also correlates to a marginal increase in depression. “If two women each talk to their friends the same amount of time, but one of them spends more time reading about friends on Facebook as well, the one reading tends to grow slightly more depressed,” Burke says. Her conclusion suggests that my sometimes unhappy reactions to Facebook may be more universal than I had realized. When I scroll through page after page of my friends’ descriptions of how accidentally eloquent their kids are, and how their husbands are endearingly bumbling, and how they’re all about to eat a home-cooked meal prepared with fresh local organic produce bought at the farmers’ market and then go for a jog and maybe check in at the office because they’re so busy getting ready to hop on a plane for a week of luxury dogsledding in Lapland, I do grow slightly more miserable. A lot of other people doing the same thing feel a little bit worse, too.