The social networking giant has recently purchased small tech company Gowalla.
Cambridge researchers use location-based tracking to help suggest friends for social network users.
Out of over 10,000 developers using Foursquare's API and location database, Instagram is the most frequent user.
Organize your social universe by checking all your networks at once with this "social discovery service."
With the Make Time For Change campaign, $1 is donated to Save The Children when you check-in at a Farmer's Market on Gowalla.
Twitter Place represents the newest addition to the world of geo-location, following emerging sites such as Foursquare and Gowalla.
The recent surge in food photography as a popular means of checking in with peers on social media sites like Twitter, Facebook and personal blogs, in many ways appears to be the digital equivalent of sitting down to a meal with friends and loved ones.