CNBC's Mandy Drury reports on the down day for U.S. markets, which are off the lows. U.S. banks are down, while Thomas & Betts agrees to be bought by ABB Ltd. Carnival says it's going to take a hit over the Costa Condordia tragedy. They don't believe it will have a long-term impact. And word is that Facebook could file its IPO papers this Wednesday. Morgan Stanley is rumored to be handling the deal.