small Resident Ial area
smallest unit of Urban Planning?
best scope for Sharing Goods? and maybe Disaster Response?
some services (Location, HyperLocal)
R Block http://www.rblock.com/ (SF only?)
Front Porch Forum (VT only?)
make your own service?
FaceBook or Ning group
make a Wiki
meta challenges: (a) promoting it to your neighbors, (b) controlling access (if it matters that a user really be a neighbor)
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