It's basically a way of finding people that share a particular interest living nearby. There is no need to register - just add your marker and keep an eye out for someone living near you.
I like these things, and I've added myself, but... there've been similar ones in the past, they don't stay up to date. I feel like without some way for users to know, six months from now, that the information they're looking at is still accurate, any given iteration is never going to be very useful for long.
An idea that's floating around in my head, I think I've mentioned it before, is that a service like this could require everyone to occasionally confirm that they're still in the same place. Send out an email once a month, they can click a link or reply to remain on the map, or ignore it to be removed.
3Evan_Gaensbauer
This is great. This is totally a thing I can use for this. Thanks!
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