Our neighborhood uses an FB group. There are typically 2-3 posts a week.

* lost and found (including pets)

* HOA announcements

* changes to the trash pickup schedule, special trash collections, etc

* other events (Santa parade)

* new neighbor introductions

* recommendations (repairs, babysitting, dog sitting)

* free stuff or stuff for sale

* general advice on house construction (many houses are similar)

It’s not important per se, and not everyone is in the group. But it does come in handy.