Allow only social registration?

Yup. Joomla has a built-in setting to disable new user registrations. JFBConnect has no problem working with that setting and will still let users registers when using a social network. Better yet, you can still use admin or user (email) activation, if you'd like.

I hope that helps answer your questions, but should you need anything else, just let me know.

Thanks,
Alex

Glad we could help answer your question. If you have any others, or if you decide to subscribe and run into any issues configuring it as above, just let us know.

Thanks,
Alex