NEW YORK – U.S. stocks fluctuated as investors weighed better-than-estimated bank earnings against Federal Reserve concerns about valuations for some social-media and biotech companies. The Dow Jones Internet Composite Index slumped 0.5 percent and the Nasdaq Biotechnology Index lost 1.6 percent. Pandora Media Inc. and Facebook Inc. slid more than 0.7 percent. Lorillard Inc. dropped…
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