Absolutely! We've been testing JFBConnect against the 3.3 betas and Release Candidates. There was one very minor issue fixed in the 6.0.4 release to ensure proper compatibility, but any 6.x release should work with Joomla 3.3.
We plan to support the Joomla 3.x series for at least how long Joomla.org will be supporting it, which is for almost another 3 years, minimum. So, you'll should feel confident that JFBConnect and Joomla 3.x will work together for quite a long time.
Of course, if you run into any issues, let us know, but so far, we haven't found any problems at all.
Thanks,
Alex
Compatible with Joomla 3.3
