[frdgr]

Besides making security/authentication even more critical, this challenges photo ownership. In Facebook terms of service, the photographer retains rights on their pictures, but transfer to Facebook certain rights to use the work. Want that?

[jrockway]

I'm pretty sure the rights you give Facebook are basically the right for Facebook to display your photo to people you share it with. That's pretty much what any photo service would require you to consent to.