Originally posted by WALRUS
I don't think there ever was a duplication glitch, they're all phishing sites or something similar.
There was a real duplication glitch at one point that involved being on the web app and PS3 at the same time then putting a player in the trade pile on the web app but not on the PS3. It was just a glitch that didn't last very long and was eventually patched.

I didn't get to try it.