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The Next-Big Shift in Social Networking: 'Niche' Sites

Closed communities are becoming more appealing for social networking sites, Mo Koyfman, an early investor in Twitter and Spark Capital Principal, told CNBC Wednesday.

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"What you are going to find is a social network of some form emerging...which is much more of a close-tie network and much more about communicating with the people we actually communicate with," Koyfman said.

Many of the early social networking applications centered on cell phones because they were inherently more personal than Web sites used at a computer, Koyfman said.

"The larger social networks have certainly become more loose-tie networks of acquaintances," he added, because networks have grown so big.

Spark recently invested in Kik, a mobile group messaging app.