RANCHO PALOS VERDES, Calif. -- Facebook Chief Operating Officer Sheryl Sandberg isn't overly concerned that teenagers will abandon the giant social network, as a Pew study reported. "We're the leaders in a growing market," she said during an onstage interview at theD: All Things Digital conference here. She acknowledged, though, that teens are using sites such as Tumblr and Twitter more. "We are watching that very carefully," she said.
Sandberg also noted that social networking and other Internet activities still trail TV in terms of time spent. Users on average watch 34 hours of TV a week, compared with 6 hours per week on Facebook. "There is room for people to do different things. All other services continue to grow and we do. We don't think it's a zero-sum game," she said...
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