how can I search an image on Facebook?

[ALIS]

The other day I found out that my friend is stealing pictures from other people's Facebook accounts. I want to find the owner of the pictures. I've already tried searching them on Google image search engine but it doesn't come back and I know they're stolen. How can I find the kidney of these pictures to let her knots that they're being copied? Thanks

[anon]

If you go to google images, you can drag an image onto the search bar to search by image. From there you should see the proper owner's facebook

[Resnick]

There is no fixed way to found it clearly.