These ideas are separated into potentially modular groups of ideas. I imagine they could each be separate modules, but I also don't see any reason they couldn't be combined in some way or another.
- Allow logging in to Gallery 3 using your Facebook account.
- Associate your Gallery 3 account with your Facebook account.
Like Button Documentation
- Facebook Like button on image and album pages.
Recent Activity Documentation
- Show a Recent Activity box somewhere in a G3.
- Show a Recommendations box somewhere in G3.
- Use Facebook Comments instead of (or in addition to?) built in system.
Live Stream Documentation
- Use Live Stream to let friends comment in real time.
Upload to Facebook
- Upload a photo or album to Facebook.
- Store information about the photo uploaded so G3 can keep track of what has and hasn't been uploaded.
- Update or delete photos based on what happens in G3. If you delete a photo in G3, you probably want to delete it from Facebook too.
- Share a photo or album on Facebook.