If anyone has sympathy for TJX Companies Inc. in the wake of a massive data breach that may have exposed the credit card data of millions of customers, they're not expressing it in the blogosphere. The Framingham, Mass.-based retail giant acknowledged that an attacker exploited a flaw in a portion of TJX's computer network that handles credit card, debit card, check, and merchandise return transactions for customers of its T.J. Maxx, Marshalls, HomeGoods and A.J. Wright stores in the U.S. and Puerto Rico, and its Winners and HomeSense stores in Canada. The intrusion may involve customers of its T.K. Maxx...