Yes, we test pretty extensively/fully support JFBConnect with both 3.4 and 3.5. Of course, we always recommend doing a backup of your site before any upgrade just in case you do run into any unforeseen problems, but we we will gladly help you to resolve any issues that arise.
-Melissa
Does JFBConnect v7.0.0 work with Joomla 3.4.8 ?
