Warning: don't get your photos legitimately purchased by a popular site.
I'm constantly chasing abuses of two of my more popular images from sites like pinterest, weheartit, tumblr and now one I didn't know about called www.hubpages.com
most of which are credited to that popular site that I assume bought legitimate licenses. There are loads and loads of images there, from all over the place, most of which I guess will be stolen.
Added: some of the pages seem to use photos by the person writing the article, story or poem, at least one I clicked on had taken wikimedia commons pics, which is fine, but others have taken pics from all over the web, apparently thinking that crediting the site they took them from makes it OK.
I've discovered one page with pics from a variety of micros, but also available from other sites (probably legitimate buyers) and another page with photos lifted from National Geographic.
So I'll soon find out how well hubpages respond to DMCAs send by their own instructions. They don't have a form like pinterest, but they do tell you what wording they require to be used in the DMCA email.