That’s the right approach. FB has its uses, but they are personal, not political. My FB friends are real-life friends also, so that keeps the arguments to a bare minimum. :)
I must add that through FB I have met cousins I never knew I had, have made new real-life friends, have learned a great deal, and have been introduced to heretofore-unsuspected riches of conservative literature. I can’t tell you how my life has been enriched by corresponding with and learning from people whom I would never otherwise have known.