How can you do that? say for example I sell cymbals and I have a reputable company, then someone makes a fake website using my pictures and "Sells" my cymbals, of course the person who buys from that fake website is never going to get a cymbal from me or see his money back.
I had nothing to do with that transaction and I am not responsible for people going to fake websites, if I was responsible I would be out of business.
You could say I am partially responsible because I was aware of the fake website (yes maybe I was and I reported it and FB or whoever took it down).
Do you know how fast 10 other websites would pop up? People need to wise up and if something seems too good to be true it probably is so in order to find out go to the source in my example my actual website and see if I am in fact offering those prices. Reputable websites have a contact us link where you can make them aware of those issues and they will take action. Also Facebook or other hosting companies are not going to fact check every single add from the millions they run everyday, that would be impossible, contact them as well to make them aware and they will remove the offending add, but again one removed 10 replacing so the better defense is to do your own research before spending your money.