if you find someone has used your photo on FB it is fairly easy to get removed. I don't bother contacting the individual anymore. I just use their online form to report them so they can eventually get shut down with repeated offenses. You have to follow a bunch of links to get to it, but you can start here to find it https://www.facebook.com/legal/copyr...p?howto_report
once you do, it's easy to fill out. they've always removed the pictures for me by the next day, it's not immediate but it's quick!