Hi Jeremy Herve,
Like David I am having many problems with Jetpack as well. Though my issue is that I have used Jetpack and the main Facebook Plugin from facebook with no problem. I went to update jetpack and did a stupid thing of removing the page already in there and then going back to put the same facebook page in and it did not allow me to do so. It only showed my profile and not choices of my pages so I would be able to choose the page again. So my posts I am not seeing post to facebook any longer.
Website
My website is http://www.globalvibemagazine.com
Facebook Page
The facebook page is http://www.facebook.com/globalvibe