Facebook added location check-ins to its iPhone app and mobile site, taking direct aim at Foursquare and Gowalla.
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Facebook
The social network at 500 million users
In 2010 Facebook was six years old, had just overtaken Google as the most-visited site in the United States on some weekly measures, and passed 500 million users in July. Its blue-and-white pages...
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Foursquare
Check in, become the mayor
Foursquare made 2010 the year of the check-in. Users broadcast their location to friends, collected badges, and fought to become the "mayor" of their coffee shop. The app's success pushed Facebook to...
