For existing Invision clients, I think this is also a great opportunity to think about recruiting and converting Facebook groups to your community. This enables you to become a "community of communities" on your IPS platform, with multiple sub-groups, clans, or tribes. You can set them up with their own Club or integrate into your main community:
Provide a haven. There are people deleting and leaving Facebook every day, especially in light of the Cambridge Analytica scandal. Why not provide a new space for those groups who are looking for a shared vision and mission without the constant privacy issues of Facebook?
Get revolutionary growth by adding a major block of new members. It's hard to attract members on a one-by-one basis and the regular organic growth may be slow. When you attract and entice a group owner, you bring his entire group over in one migration.
Build out your niche. Add all the knowledge and topics of your sub-communities to strengthen your existing knowledge. The new clubs can either broaden the relevancy of your niche, or deepen your community's authority.
Become an Admiral, not a Captain. A captain steers one boat. An admiral steers a fleet of boats. It's a whole new level of challenges and rewards when you administer a community of communities where you lead multiple captains. It gives you power in numbers to do more, with more members, more activity, more enthusiasm and creativity.
I think there's never been a better time to go fishing in Facebook's muddy waters, and to start poaching Facebook groups who are looking for a new home.