Add "Facebook depression" to potential harms linked with social media, an influential doctors' group warns, referring to a condition it says may affect troubled teens who obsess over the online site.
Researchers disagree about whether it's simply an extension of depression some kids feel in other circumstances or a distinct condition linked with using the online site.
But there are unique aspects of Facebook that can make it a particularly tough social landscape to navigate for kids already dealing with poor self-esteem, said Dr. Gwenn O'Keeffe, a Boston-area pediatrician and lead author of new American Academy of Pediatrics social media guidelines.
With in-your-face friends' tallies, status updates and photos of happy-looking people having great times, Facebook pages can make some kids feel even worse if they think they don't measure up.
It can be more painful than sitting alone in a crowded school cafeteria or other real-life encounters that can make kids feel down, O'Keeffe said, because Facebook provides a skewed view of what's really going on. Online, there's no way to see facial expressions or read body language that provide context.
The guidelines urge pediatricians to encourage parents to talk with their kids about online use and to be aware of Facebook depression, cyberbullying, sexting and other online risks. They were published online today in Pediatrics.
Abby Abolt, 16, a Chicago high school sophomore and Facebook user, says the site has never made her feel depressed, but that she can understand how it might affect some kids.
"If you really didn't have that many friends and weren't really doing much with your life, and saw other peoples' status updates and pictures and what they were doing with friends, I could see how that would make them upset," she said.
"It's like a big popularity contest -- who can get the most friend requests or get the most pictures tagged," she said.
Also, it's common among some teens to post judgmental messages of people they don't like, said Gaby Navarro, 18, a senior from Grayslake, Ill.
"Parents should definitely know" about these practices, Navarro said. "It's good to raise awareness about it."
The academy guidelines note that online harassment "can cause profound psychosocial outcomes." Last year's suicide of a 15-year-old Massachusetts girl occurred after she'd been harassed, in person and on Facebook.
O'Keeffe said the benefits of kids using social media sites like Facebook shouldn't be overlooked, however, such as connecting with friends and family, sharing pictures and exchanging ideas.
"A lot of what's happening is actually very healthy, but it can go too far," she said.