TL;DR: To move a Facebook Group to your own platform, announce the move 30 days early with a clear member benefit, run both spaces in parallel for 2 to 4 weeks, migrate your 50 most active members first with personal invites, recreate only the 3 to 5 best-performing content rituals, and then switch the old group to read-only with a pinned redirect. Expect 30 to 50% of members to make the jump —...