Too bad I do not have a FB account, but the screenshots look awesome. The stream page is kinda taking away from it, imo. I would focus 100% on photos.
You have done a great job with the rest, navigation, and image browsing. There were a few glitches, the user info box and posts in the feed with images in them could use some finish.
All in all, great job and I think I understand where you're going with this!