"Everybody was expecting these to be positive studies, " says Harlan Krumholz, a cardiologist at Yale Medical School, who wrote one of three perspectives that accompany the studies in the New England Journal.

FORBES: Magazine Article

"We have never seen a social space that actually works for everybody, " says danah boyd, who studies youth culture, the Internet and social media as a senior researcher at Microsoft Research.

NPR: As Facebook Matures, Is It Losing Its Edge?

"What we're putting in place is a structure where everybody is being bought off to participate, " says Daphne Wysham, a fellow at the Institute for Policy Studies in Washington, D.

FORBES: When Pigs Fly