Shortly after news of big losses for Barnes & Noble's Nook, the company's CEO is exiting. William Lynch, named CEO in early 2010, had made the firm's digital business paramount, the Wall Street Journal notes, working on an array of Nook gadgets. Now, however, Barnes & Noble is quitting manufacturing its own color tablets. "Barnes & Noble was too small to compete in the tablet business in a world of giants," says an analyst. A new CEO hasn't been named, but CFO Michael Huseby has been dubbed chief executive of Nook Media LLC and president of Barnes & Noble—both new positions, the Journal reports.