I've moved several times in the last year, and (unfortunately) FB is how I:
- connect with local groups of parents (FB has no competition in this vertical)
- connect with local athletic groups (Strava and others exist, but try planning an outing on Strava)
- see what the local take-out restaurants are offering today (FB and Instagram own this niche, which has exploded)
- get recommendations on contractors, service providers, etc (often passively, by searching groups for recent answers to someone else asking the same question)
- find out about when local organizations or companies I care about are doing something (you can't really rely on libraries etc. announcing things via email anymore, but they won't do anything without posting to FB)
On top of all this, I use Instagram, not only to post photos but also to explore the area around where we've settled. I search by location a ton and have found it's a great way to learn about what people do and where they go when you're not able to meet people and get recommendations the normal way.
So yeah, I rage quit previously but FB has got my number again.