> You can quit. We can quit.
> Sometimes I run into a group that I want to be more involved with that organizes on Facebook. When I mention I want to be involved but am not on Facebook, there is usually sympathy and a response that there are others interested in the group which are not on Facebook, either. Many organizations are multi-platform to be inclusive, and more organizations if more people spoke up to request a non-Facebook option.
I have not found this to be the case for casual (eg, meetup of strangers) or small (< 20) groups. They pick one coordination method and it's take it or leave it. Non-FB solutions have a strong drawback of some sort (lack of adoption, complexity of use, etc). Facebook groups and events are just super easy to set up and blast out.
I've been unable to avoid FB's groups and messaging. Adoption is just too high and so many people just can't be bothered to use something else.