In reply to Michael.

There is an existing and seemingly successful site that caters to this exact niche that has been operating for 2+ years called asmallworld - http://en.wikipedia.org/wiki/ASmallWorld

In marketing it isn't just enough to get attention, you need to get the right kind of attention. Articles writing about netropolitan which are read by plebs won't really help them at all. Neither will the fact that the site is down and was cobbled together in a few hours with no optimization or any real professional attention.