There is a group on Facebook calling itself 'Lovers of Ocean Liners'. Have a look around that site and you will see hundreds of images 'borrowed' from Shipspotting.com, including some of my own. In all cases no credit is given to the photographer, or this site.
One of the chief contributors of 'borrowed' photos is an administrator there called Kipfer Fox. He and others on that site seem to feel that this practice is quite acceptable. I don't think so.