I see the same with homeschool groups where I live. I grew up homeschooled. We had a very large homeschool group get together at our church once a week and did outings together on occasion. We even had a group that would go on vacations together! No Internet at all...All it takes is one or two people willing to coordinate it all, no Internet needed at all. Technology kills human interaction sadly. My suggestion would to just be the coordinator over forcing others to adopt a new platform. It will require more work though.