I would be extremely grateful (and I'm many others would be too) if you would upgrade your component to work with 2.5.4.
After updating from 1.7.5 for example and being (mostly) sure it had worked (!), it would be very reassuring to be able to check with this!
Sorry for the delay in response to this post; we've been busy working on getting new releases of JFBConnect and JLinked out. I've just uploaded new versions of Version Verification Tool and they should be available for download now. For Joomla 2.5, versions 2.5.0 through 2.5.4 are now supported. For Joomla 1.5, version 1.5.26 is now supported.