PALO ALTO, Calif.–"The stream of information coming at you can be overwhelming," Facebook Chief Operating Officer Sheryl Sandberg said when asked in an onstage interview what she thinks of social-networking fatigue. "I think people sometimes feel uncomfortable hitting ‘ignore’ (on friend requests), but if you don’t want to connect to someone, that’s why it’s there."

Facebook, after all, is on top of the world. It doesn’t make much difference to the health of that 300 million-member user base if your "social graph" is one degree smaller.

Sandberg, who joined Facebook a year and a half ago… Read the rest