Target has increased the estimate for the number of customers exposed in the massive hacking attack between Thanksgiving and December 14. It now appears at least 70 million consumers had their credit cards compromised. Also, Neiman-Marcus announced that they, too, were victims of a cyber attack over Christmas. And in an exclusive report, Reuters is saying that several other well known retailers were also hacked over the holidays. Neiman Marcus said an outside forensics firm discovered evidence on January 1 that indicated the retailer had been the victim of a cyber attack. It disclosed the breach nine days later, after...