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Facebook adds geolocation, check-ins to iPhone and Web apps
By Jacqui Cheng

Facebook has finally joined the rest of the social media world by announcing "Places," a feature that lets users "check in" to a geographical location and broadcast that info to friends. Made for use with mobile devices, Places also allows users to see who else has checked in at a particular location and even tag friends who are there with them. As usual, however, certain groups are already criticizing some of Facebook's settings, saying that the defaults are too fast and loose with users' privacy.

http://arstechnica.com/web/news/2010/08/facebook-adds-geolocation-to-iphone-web-apps.ars