Kray,
No worries. It's a confusing setting.. we know..

It will be fixed soon, as you're not the only one to ask that question.
As for adding Twitter, we have plans to next year, but haven't even started scoping it out. We just launched our LinkedIn extension.. Google+ and/or Twitter are next, but going to let things settle down with LinkedIn first. Don't want to get in over our heads.
Finally, please consider leaving a rating and review on the Joomla Extension Directory for JFBConnect, or our support. It's certainly not required, but very appreciated!
extensions.joomla.org/extensions/social-...ook-integration/7215
Good luck,
Alex