Malin,
We don't include a share button in JFBConnect because Facebook deprecated it. While it still does work on some sites, the 'old' share button actually can cause a few different types of conflicts with the 'newer' features that Facebook has available, and that JFBConnect implements. For more information about the discontinuation of Share, see:
www.sourcecoast.com/jfbconnect/docs/comm...tions#share-conflict
In it's place, Facebook recommends the Like button with Open Graph tags, which actually gives the administrator more flexibility to set the title, description, and image for the page, while still allowing the user to add a comment about the page they're about to Like/Share.
Hope that helps, but if you need anything else, just let us know.
Thanks,
Alex