Can we get an official action of some sort to deal with photos uploaded to stack.imgur where the poster clearly does not own the copyright? As discussed before with no response, the ease with which photos are uploaded makes it unclear that this is happening, and there's no discussion of terms or anything at that point.
When the image is hotlinked rather than uploaded, it's a legal gray area I won't get into. (When it's hotlinked from another hosting service that the user doesn't have legal permission to upload to, for example, the veil is pretty thin.) But it's practically a problem for Creative Commons licensing of the site when the photo is integral to the question or answer, because reuse is impossible.
It's not my job to enforce this, and it feels really unfriendly to harp on other users about this. Right now, mods enforce it selectively (because it'd be a lot of work to deal with every instance), sometimes resulting in unreasonably angry (but perhaps justifiably confused) users. But it's also really problematic and something the site should care about. If I edit a post with a problematic image without doing anything about it, am I contributing to the infringement? As an editor of a collective work, I might be! (What if I just vote it up, or accept an answer?)
I would be perfectly fine with an official statement that all photos uploaded are automatically limited to a small size (they are) and that Stack Exchange considers the small-size representations to be fair use for educational purposes and commentary and criticism. That may or may not hold up in court in particular instances (I'm not a lawyer, obviously), but it'd put the users off the hook, which is where you've got us now.
Or as stated in my earlier post, some summary of or even link to the copyright policy in the upload form would be a good.
Basically, what I'm saying is: Stack Exchange employees, please handle the legal responsibilities here so the user community and moderators don't have to.