FILE - In this May 25, 2017, file photo, Facebook CEO Mark Zuckerberg delivers the commencement address at Harvard University in Cambridge, Mass. Zuckerberg says his "personal challenge" for 2018 is to fix Facebook. Zuckerberg wrote in a post Thursday, Jan. 4, 2018, that he now wants to focus on protecting Facebook users from abuse, defending against interference by nation-states and “making sure that time spent on Facebook is time well spent.” (AP Photo/Steven Senne, File)
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