An anonymous reader writeswith a link to a BBC story which mentions in passing the Urban Tapestries project for distributed, collaborative location-based note-taking, excerpting "In practice this means giving people a specially-equipped mobile phone that allows them to wander around central London and leave virtual notes for other people to read by writing them on the phone and then 'sticking' them to a building. It works because the position of each phone is constantly tracked so when a note is written the place can be noted - when someone else goes to the same place, they can read the note."
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