From The Madison Courier:
Q: If the newspaper uploads its photos to its Facebook page, can it still exert copyright against someone who uses the photos on another website?
A: Yes. Under the terms of Facebook’s agreement with its customers, the copyright for any photos remains protected for the person who created the photo.
You legally could contact the website’s owners and request that they refrain from appropriating your photos for their benefit.
Contact Steve Key, HSPA executive director and general counsel, with media law questions at firstname.lastname@example.org or (317) 624-4427.