A new web site, built by students at Rutgers University in New Jersey, shows Google Street View pictures of locations where photos are uploaded to Instagram.
SM.Rutgers.edu/thebeat harvests data from Instagram to identify photos to their physical location, reports the Daily Mail.
The web site has a search tool which allows users to search images and then shows a stream of pictures from Instagram, revealing exactly where and when they were taken.
Gizmodo.com has called the web site a "stalker's wet dream."
There is a blacklist for certain search terms such as "underwear," "porn" and "sex."
The web site legally uses data from Instagram's application programming interface (API), which allows third-party developers to use information from the site to put together their own apps.
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Nick Pickles, director of privacy campaign group Big Brother Watch, told the Daily Mail: "People might be happy sharing photos of what they’re doing, but how many people would want where they are doing it to be public? Location data is one of the most sensitive pieces of data and yet countless apps are using it without most people knowing."