There's this wonderful thing called the DMCA - the Digital Millennium Copyright Act - which requires websites to remove content that is stolen intellectual property. This includes photos, sketches, written documents, and many other forms of digital media. Nearly all websites which host media content will have a DMCA takedown report form so you can report stolen images electronically.
Most recently, a lot of folks in the Taxidermy community here have had issues with an Anti-Fur group on Facebook stealing their images illegally to use for their own bullshit agenda. Here is the form you need to have the image taken down: www.facebook.com/help/contact/…
There are two options you can click to report. If you want a photo removed, you will need to click the bubble for "copyright", then "continue with copyright report".
On the next page, click "I found content which I believe violates my copyright".
Fill out your name, company name and all other information.
If you've posted the image here on DA, or etsy, or Flickr, you have a copyright over the image. Facebook is legally required to remove the content ASAP.
Hope this helps!