FILE- In this Sept. 20, 2016, file photo, Facebook CEO Mark Zuckerberg and his wife, Priscilla Chan, smile as they prepare for a speech in San Francisco. The 33-year-old billionaire and his wife stopped by Quincy High School on Tuesday, May 23, 2017, and made a donation to the school. Chan graduated from Quincy High as valedictorian in 2003. (AP Photo/Jeff Chiu, File)
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