Online services designed for spatially restricted groups (compare with CityInformationSystem)

There used to be half a dozen links here to online services focused on neighbourhoods and strict localization.

They've all gone.

Which is interesting.

I'm sure there are other new ones. But is it worth collecting links to them.

Does the local simply not have the persistence and utility of geographically global online social networks?

It suggests that global networks can do everything that specialized local ones can. There's no need for a special service.