Rick Federico, CEO of P.F. Chang’s, announced on Thursday that all their locations in the continental US were moved to a manual credit card imprinting system. The decision has been taken after a large amount of credit cards went up for sale on an underground forum and, after some investigation, it resulted that all of them had been used at P.F. Changs from the beginning of March until May 19. The security breach was made known to the company this week, on Tuesday, by the United States…