There was a feature request by bergie in the midgard2maemo project about this: https://garage.maemo.org/tracker/ind...d=106&atid=460

Now replace "developer" for "user", and update it with the latest technologies. Also, would be nice introduce t.m.o in the formula.

It looks how a more long-term project than just a map with people's location, but it could be refined to a more concise plan.