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This technology will theoretically enable fb to approximate your geographical location at a given time: http://kristiandupont.com/blog/2010/10/face-recognition-

• hamner 15y ago
  Phone carriers already have this data, and Facebook does as well every time you access their website over standard methods
• pavel_lishin 15y ago
  > then it hit me that this picture is likely to end up on Flickr, Facebook or some other online service. And even if it’s not visible where the picture was taken, it is probably geo-tagged, and it definitely has a time stamp. Which means that there is now proof of my whereabouts yesterday, available on the internet. One solution is to spam photos of yourself with false timestamps and geodata.