There probably is just have to be reviewed and the settings. I didn't build the sa facebook mod originally so don't know the code well.
I made a serious of tests with the settings and concluded that the conflict appears when Open Graph is enabled. Not enabling it, solves the photo sharing to Facebook from the gallery.
From this mod, I just don't understand what was supposed to appear on the main page of the Facebook action link from the menu (I do understand the Invite Friends while "Your Friends" should only appear the ones registered on the site)