Anyone who’s not using a social network probably wonders what the fuss is all about.

But for those who use Facebook, Twitter or LinkedIn, and that’s more than half of all adult Americans, the answer revealed by a new study released today will come as no surprise at all: social networks let them stay in touch with family members and connect with friends.

The Pew Research Center found that’s the “major reason” given by six of every 10 users of Facebook, Twitter or LinkedIn. And half of the people surveyed said the ability to reconnect with old friends played a “significant role” in using social networking.

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“For the majority, social networking sites are most important as a way to share and communicate with friends and family who are already key social ties,” Pew senior research specialist Aaron Smith.

“Activities such as meeting potential dating partners or interacting with public figures are much less relevant than deepening bonds with those who are already important.”

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