FediHood is a social network built around the place where you live. You choose a city and the topics you care about, then read what neighbours are saying and join in.
It stays a normal fediverse app. Your posts can reach Mastodon, PixelFed, Misskey and the rest, and posts from those servers reach you too.
Source code: https://git.holos.social/tom79/FediHood
There’s only one instance so far: https://fedihood.social/
If new instances are created, they should show up here: https://fedihood.fediverse.observer/list
Realistically, they’ll build FediHood against Mastodon and its inner workings and call it a day.
Friendica, Hubzilla, (streams) and Forte all have (partly optional) dedicated profile fields for your location (street, town, postal code, region/state, nation, Facebook-style “hometown” as in place of origin). FediHood could use these. But, like so often, I’ve got my doubts that the makers of FediHood even only know that Friendica exists.
I mean, if they really knew even only Friendica and Hubzilla, they would have made FediHood a third-party add-on for Hubzilla.