Gowalla

Facebook Acquires Gowalla, Will Not Receive User Data
Smartphone Users Less Likely To Checkin Than Perform Other Tasks [Study]
MomentFeed Receives $1.2 Million In Funding, Assists Geo-Location Based Advertisers
Gowalla’s Newest Update Is Foursquare
Checking In From A Warzone? Airforce Warns To Avoid Foursquare, Other Services