Joost,
Great to hear, and yeah, we're a little dumbfounded as to why it didn't install in the first place.. very strange, but glad you got it going.
If you run into anything else, just let us know. Also, if you have a moment, please consider leaving a rating and review on the JED for JFBConnect and/or our support. It's certainly not required, but very appreciated:
extensions.joomla.org/extensions/social-...ook-integration/7215
Thanks, and good luck,
Alex