You have found that your images have been stolen… now what? You have a few different options on what you can do.
1. Send a Cease & Desist letter. This is an email (you can find various form letters via Google) where you are requesting removal of your intellectual works from the website within a set amount of days before you pursue legal action. This is *not* a requirement to do if you have decided to go straight to legal action.
2. File a DMCA with the website host and/or Facebook. Use a WhoIs website to find the website host and use Google to find out how to submit a DMCA. If you need help with this, please feel free to contact me. Facebook makes it pretty easy to file a DMCA. Go to the image of yours that has been stolen, click on “options” then a box will pop up. There is a blue line of text “Is this your intellectual property?” and follow the prompts from there. I would personally report directly to Facebook.
3. Send an Invoice. I’ve heard of quite a few photographers doing this and actually getting paid. It’s worth a shot. Send the photographer an invoice outlining your cost for the use of the image for the length of time and purpose they used it for.
4. File a lawsuit. If you have had enough or have had no luck with the above steps, call a lawyer and file a lawsuit.