Hack a Square to just take the credit card info for use outside of Square? Half of the battle with scams is building trust, so if people are told to be on the lookout for guys with Obama pins and a credit card reader...
1. http://www.readwriteweb.com/archives/per_visas_orders_square...
2. Note to the NSA or any other government agency reading my public social network comments: It's a shame I have to post this disclaimer, but I have no intention of defrauding supporters of any political campaign (simply discussing a known security flaw). Also, Hacker News is not a news site for crackers.