Another thought I have on this is that getting the user to sign in via Google/Facebook/Twitter might help. There's nothing stopping fraudsters from having a Goo

Another thought I have on this is that getting the user to sign in via Google/Facebook/Twitter might help. There's nothing stopping fraudsters from having a Google or Facebook account with a dud identity, of course, but at that point it might seem much easier to hit a different business. Has anyone had any experience with this approach? Does it work?