Yahoo CEO Jerry Yang ponders a question during a talk at the Web 2.0 Summit in San Francisco, Wednesday, Nov. 5, 2008. Facing a legal battle that would have illuminated its widening market power, Google Inc. turned its back on its struggling rival Yahoo Inc. and pulled the plug on an Internet advertising partnership that had been conceived to keep Yahoo out of Microsoft Corp.'s clutches. (AP Photo/Paul Sakuma)

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