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In this case, I will tag a friend of mine, Martyn who also has a BlackBerry and is in on this stunt as well. You simply enter their name and depending on their privacy settings, they will be added and tagged in that location also without any authorisation on their part (which in itself is a privacy breach)
Please read the disclaimer! You can find this and more, including the explanation - as well as the pro's and con's of using spoofed geolocation on the ZDNet iGeneration blog.