We just pushed out v5.2.1 of JFBConnect. This is a minor release, but has over 30 fixes for issues that have cropped up since the v5.2.0 release, which included Joomla Twitter Authentication, EasySocial social network integration, new registration flows and other features.
The biggest fix in this release is an update to the Autotune configuration tool, which broke due to changes that Facebook implemented on November 13th. Most other issues are cosmetic (alignment issues, Twitter's custom image option in the SCLogin module didn't work, etc). There are no security or major issues fixed in this release, but it's always recommended to upgrade to ensure you have the most solid version we offer.