You can share your Ripl animations directly to any Facebook Groups that your personal Facebook account is the admin of. Because of the way Facebook permissions work they won't allow us to share your creations to Facebook Groups that you're a member of but not the admin.
On the final "Caption Your Post" screen you can select to share to your Facebook Groups by tapping the switch next to Facebook Groups. If you don't see the Group listed that you want to share to, tap "open" next to "Account Settings" to add the Group. Don't forget to press the final "share" button in the upper right hand corner to begin uploading your animation to your selected social media networks.