Last month it introduced a service called places that encourages people to "check in" at places they visit and broadcast their location to friends.

上个月，它还启用一个被称为“定位”的服务、鼓励人们在他们造访的地点登录网站并给好友播报其位置。

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The product is not unlike the popular Foursquare location-based service, and lets you “check-in” at a place and send a notification to your friends who are nearby.

这个产品和现在流行的Foursquare地理定位服务不同，它可以让你在某个地点“签到”，然后会给你这个位置附近的好友发送消息。

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Unlike some Web-based phenoms, the location check-in service Foursquare has an obvious potential business model: local ads based on your geographic location, perhaps coupled with inferred interests from your previous check-ins.

FORBES: Foursquare's Dennis Crowley: It's Still About Growth, Not Ad Money (Yet)

Less than a month after photo social network Instagram caught huge flak over advertiser-friendly changes to its privacy policy (and claimed it was misunderstood), another social network, the location check-in service Foursquare, has announced revenue-friendly changes to its privacy policy.

FORBES: Foursquare Checks In To Real Names And Sticks A Big Fork Into Pseudonymity

But the company is mainly built on the location-based check-in service.

FORBES: Why Facebook And Booyah Could Burst Foursquare's Location Bubble