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A session talking about what people can/are doing with proximity sensing (and how/why in many cases, locative services aren't about absolute (geo) location, but relative location. Covering implementation and code of Bluetooth in particular, including information on the setup I used at Where 2.0 and WhereCamp 2008. (The morning session already covered lots of concerns about privacy that are applicable here, so this session will focus on cool stuff you can do and how to get out there and do it)