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Now Playing: 7/25/13 Marketplace - Criminal charges for SAC

The Justice Department has charged big hedge fund SAC for insider trading. High-profile actions like this are rare: Think Enron and Arthur Andersen. And remember, both those companies ceased to exist in any real way after their criminal charges. Also, Facebook stock is booming as mobile advertising at the company showed real promise. Will users be turned off as even more ads show up in their mobile news feed?