Flickrock Is Republishing Your Flickr Photos Without Your Knowing

I got a mysterious Tweet from someone I don't know after I posted a photo of our recent back yard camping experiment:  "@ringmaster Check out that Flickr gallery using Flickrock!  flickrock.com/asy"

So that's odd.  Why are my copyrighted photos appearing on this other person's web site? Hey, look! All of my friend's public Flickr account photos are being re-published there, too! That's not cool.