CHICAGO — Eily Toyama gave in after friends pestered her to join Facebook. But she used her cat's name instead of her own so she could avoid networking requests from people she didn't really want to connect to. And don't even ask her about Twitter unless you want to get an eye roll.

"I just don't think people need to know that much about my life," says the 32-year-old Chicagoan, who works in information technology.

Call it online sociability fatigue. And it's not just being felt by older folks who have lived most of their lives without the Web. As social networking grows, from stream-of-consciousness Twitter to buttoned-up LinkedIn, even some of the very young people who've helped drive these sites' growth could use a break.

Mike Nourie, a student at Emerson College in Boston, says he feels a little relieved to escape social networking when he works summers at a Cape Cod inn where connection is spotty.

"It gives me a chance to relax and focus on other things like music, work and friends," says the guitar-playing 20-year-old.

Last month, Alex Slater took it a step further. He dumped his Twitter account and stripped the information on his Facebook page to a minimum. Though he has more than 600 "friends" on Facebook, he checks it less often.

"Being exposed to details, from someone's painful breakup to what they had for breakfast — and much more sordid details than that — feels like voyeurism," says the 31-year-old public relations executive in Washington, D.C. "I'm less concerned with protecting my privacy, and more concerned at the ethics of a 'human zoo' where others' lives, and often serious problems, are treated as entertainment."

A recent survey from the Pew Internet & American Life Project found that 45 percent of Americans in all age groups are enthusiastic about socializing via computer and mobile devices. Meanwhile, 48 percent are indifferent to Internet social networks, overwhelmed by gadgets or often avoiding Internet use altogether.

Perhaps most surprising was the presence of a group that fell in between — the remaining 7 percent of. These people, who had a median age of 29, are savvy about social networks and always carry mobile devices — and yet are conflicted about staying in constant contact.

"They have this anxiety about shutting off," says John Horrigan, the associate director at Pew who wrote the report. "They're afraid they might be missing something. But we also find them yearning for a break."

Gary Rudman, who tracks youth trends at GTR Consulting, has seen it, too. "Bottom line: Who wouldn't be fatigued, given all of the social and business networking obligations thrust among young adults? With Facebook, LinkedIn, Plaxo and Twitter, young adults struggle to keep up to avoid the consequences — being left out of the loop or becoming irrelevant," he says.

It shouldn't be surprising that quick-hit online communications, the stuff of 140-character "tweets" on Twitter and "status updates" on Facebook, leave some people cold. Craig Kinsley, a professor of neuroscience at the University of Richmond, notes that studies of human interactions reveal that our brains crave networking, online and off, but differentiate between the quality of the interactions.

"Many short contacts may leave the user wanting deeper, more meaningful exchanges. Like a meal of cotton candy, when you come right down to it, there is not much substance," he says. "A good conversation with a good friend is much more life-affirming than a few tortuously abbreviated or emoticon-filled lines in a tweet that anyone can read. How special is that?"