Facebook CEO Mark Zuckerberg has said connecting the world means bringing people together. But increasingly the platform is being used by some very powerful elements to sow divisions. Justin Sullivan/Getty Images hide caption
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Facebook CEO Mark Zuckerberg (right) speaks with panelists at the Facebook Communities Summit on Thursday in Chicago, where he announced Facebook's mission will change to focus on the activity level of its users. From left are Lola Omolola, Erin Schatteman and Janet Sanchez, who run popular Facebook groups. Teresa Crawford/AP hide caption
Mark Zuckerberg told graduates to pursue "big meaningful projects." Paul Marotta/Getty Images hide caption
The 2020 election cycle might have already started. The Federal Election Commission shows that 129 people have filed to run for president in the next election. Annette Elizabeth Allen for NPR hide caption
NPR reporter Aarti Shahani tested Facebook's new social VR platform. She requested an older avatar to represent her, but that was not available. Her guide "Phil" had her tour virtual cherry blossoms. NPR hide caption
Facebook claims to have 1.23 billion daily users globally. Mark Zuckerberg recently announced that he wants that number to grow and for users to conduct their digital lives only on his platform. bombuscreative/iStock hide caption
Facebook CEO Mark Zuckerberg says his company is responding to sharp criticisms over fake stories appearing in its news feeds. He's seen here speaking Saturday at the APEC CEO Summit, part of the broader Asia-Pacific Economic Cooperation (APEC) Summit in Lima. Rodrigo Buendia/AFP/Getty Images hide caption
How does Facebook decide when to take down controversial images and posts? Chelsea Beck/NPR hide caption
From Hate Speech To Fake News: The Content Crisis Facing Mark Zuckerberg
Facebook CEO Mark Zuckerberg is defending the company against criticism that it doesn't vet fake news in its news feed. Eric Risberg/AP hide caption
CEO Mark Zuckerberg defended Facebook against criticism that it doesn't vet fake news in its News Feed. Lluis Gene/AFP/Getty Images hide caption
Cori Bargmann is applying her training as a neuroscientist to shaping the Chan Zuckerberg Initiative's ambitious agenda. Chan Zuckerberg Initiative hide caption
Facebook CEO Mark Zuckerberg and his wife, Dr. Priscilla Chan, have a new goal: cure, manage or eradicate all disease by the end of this century. And they're putting up $3 billion. Jeff Chiu/AP hide caption
Facebook CEO Mark Zuckerberg and his wife, Priscilla Chan, rehearse for a speech in San Francisco. Jeff Chiu/AP hide caption
Guglielmo Giovanni Maria Marconi, Italian physicist and inventor, with one of his first wireless telegraphs. A. DeGregorio/Getty Images/DeAgostini hide caption