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'Check-in' craze moves beyond location

Despite the press, geolocation service Foursquare is still pretty small. But it's proven influential in another way: the phenomenon of "checking in" has spread beyond telling people where you are, and a handful of services now focus on letting you "check in" to what you're doing--whether it's attending a concert or reading one of those ubiquitous Stieg Larsson novels.

One of them, GetGlue, announced Wednesday a partnership with HBO to promote its current series "True Blood," "Hung," and "Entourage," in which users who use the GetGlue iPhone … Read more