In this April 30, 2014 file photo, Facebook CEO Mark Zuckerberg delivers the keynote address at the f8 Facebook Developer Conference in San Francisco. Zuckerberg and his wife, Priscilla Chan, are donating $25 million to the CDC Foundation to help address the Ebola epidemic, the foundation said Tuesday, Oct. 14, 2014. (AP Photo/Ben Margot, File)
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