Facebook appears to have competition for teens’ attention, and they’re drifting to other social-media sites as evidence mounts that the growth of the world’s largest social network is slowing.

Drawn to niche sites such as Foursquare and Tumblr, teens appear to be expanding beyond Facebook. According to market research firm YPulse, 18% of teens prefer to “check in” on Foursquare instead of Facebook, and 10% say Pinterest is a better site for browsing.

“We’re supportive of these websites growing, and the websites integrated with Facebook are more social because of it,” said Malorie Lucich, communications manager for Facebook.

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