Hi it seems that Facebook is blocking any image coming from "og_userfiles" so anything you wanna like using Addthis or Facebook share button won't post to Facebook, the integrated Seo system saves images in "og_userfiles" too and won't work...

Photos, user profiles cannot be shared or liked...

For testing Debian you can go to my site and try to share photos or profiles.. Google + and Twitter aren't affected..

regards..