Google snuck in a pretty savvy checkin service. If Google+ takes off, it could be a worthy competitor to foursquare and (especially) Facebook Places. Google Check-ins, as they appear to be calling it, shows up front and center in the mobile app. It’s actually featured more prominently than the “share” button that sits next to it. Clicking the “check in” button takes you to a list (from Google Places, of course) and a single click checks you in. Like the rest of Google+. the addition of circles offers a much more nuanced approach to privacy than services like foursquare or Facebook are able to offer. With foursquare you can choose only two levels of privacy: entirely private or shared with your entire circle of friends. Facebook lets you set a global privacy level for all your Places checkins, but there’s no choice for individual checkins. - Jordan