And even Loopt shared information that would let a third-party track a user across multiple networks.
FORBES: Watch Out: Check-in Apps Share Your Location With More People Than You Think
By checking in with Loopt Star, users can also gain achievements, coupons or other rewards.
Loopt offers an app that allows you to find information and discounts on local businesses.
Finally, going gently into that good night were location-based networks Loopt, Brightkite, and Gowalla.
Retailers on Loopt Star pay the company an undisclosed fee for every visit the app gives them.
Graham discussed Sam Altman, founder of Loopt, who applied for YC when he was a sophomore in college.
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Nevertheless, a number of YC companies have had clean exits, including Heroku, OMGPOP, Loopt, Cloudkick, Wufoo, and Reddit.
The newest version of location-based social network Loopt allows users to continuously update their friends on where they are.
Simpson said location-based social networking software like Foursquare or Loopt helps marketers, advertisers and participants with the bigger picture.
FORBES: Checking Out Where Consumers Check In Helps Marketers
The company said those expenses include retention payments, ongoing salaries and benefits for Loopt employees, wind-down expenses or current Loopt services and other integration expenses.
Loopt, which is rumoured to be a potential takeover target of Facebook, has added software that automatically monitors its service for suspicious patterns of behaviour.
In addition, Facebook filed the patent back in February 2007, way before most of these companies started up, including Loopt, which launched a few months later.
Whereas Loopt, Foursquare and Gowalla are well known, a growing number of users are looking into lesser-apps like FastMall and AroundMe on the iPhone and BeatTheTraffic on BlackBerry.
According to the report, 19 of the 20 (all but Loopt) shared information with third parties in a way that could allow them to connect online activity to actual identity.
FORBES: Watch Out: Check-in Apps Share Your Location With More People Than You Think
The app was also built on Facebook Connect, meaning that Loopt Star users register for the app using their Facebook logins, and can then share updates with their friends over the social network.
The size and scope of Apple's developer program remains a bit of a mystery, but Apple has already shown off demos from online auctioneer eBay, mobile social-networking start-up Loopt, blogging service TypePad, the Associated Press and game developer Pangea Software.
The size and scope of Apple's developer program remains a bit of a mystery, but Apple has already shown off demos from online auctioneer eBay (nasdaq: EBAY - news - people ), mobile social-networking start-up Loopt, blogging service TypePad, the Associated Press and game developer Pangea Software.
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