Wikipedia
Brightkite
Brightkite was a location-based social networking website. Users were able to " check in" at places by using text messaging or one of the mobile applications and they were able to see who is nearby and who has been there before. The service was created in 2007 by Brady Becker, Martin May, and Alan Seideman who previously founded the SMS notification service Loopnote. In April 2009 Brightkite was acquired by mobile social network Limbo.
By December 2011, all Brightkite apps had been pulled from app stores and the Brightkite website was replaced with a message stating, "This is not goodbye...we're just moving on to something better".
By April 2012, the Brightkite website no longer appeared to be in operation.