I have not. There's really no sense in which Facebook isnt possible for me. I could say that I have privacy concerns but I'm genuinely not interested in being a weirdo parent that puts pressure on my kids. Most of the organizers are just trying to find a platform that is "gated" (by invite only) and everyone uses. Hard to beat FB for that in 2022.
Is it actually used for anything important? When I was in sports clubs pre-internet I can't remember any important communication between leaders/parents other than what was shared at pickup/passed home via the kids.
I see lots of kid/parent related stuff done via Facebook with family members with kids + I and am curious how necessary it is (i.e. would I be able to just not use it + still get necessary info).
It's a good question. For one, ALL communication is done via Facebook, and this includes changes. For example, just today our indoor soccer league had a covid-related cancellation of our games today and tomorrow. If not thru Facebook it would have to be done with phone calls or email, both of which are possible but more difficult to manage.