I live in a somewhat large gated community that has a pretty active facebook group. The group is somewhat loosely moderated by the HOA (for better or worse) so in general people stay on-topic and neighborly. It's great for asking for recommended contractors, asking if somebody has a thing they can borrow, etc. This is one of the few things that keeps me on facebook.
Of course facebook is a terrible venue for this group - with its algorithmic feed, horrible search, and showing "notifications" when nothing of consequence has actually happened. If there were a more prevalent network I'm sure the group would move but there's really no other alternative that already has a critical mass of users and people aren't going to sign up for a new service unless everyone else in the neighborhood is already there.
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