Students of Unified Educational Centers (CEU) attend a lesson on 'Fake News: access, security and veracity of information', in Sao Paulo, Brazil on June 21, 2018. Media analysis is a compulsory subject in Brazilian schools. MIGUEL SCHINCARIOL/AFP via Getty Images hide caption
Social media company Meta's headquarters in Menlo Park, Calif. The Facebook parent company says it has removed a Russian network pushing a pro-Kremlin view of the war in Ukraine and a Chinese network targeting the U.S. midterm elections. Justin Sullivan/Getty Images hide caption
Brazil's President Jair Bolsonaro greets supporters during a reelection campaign rally. Ahead of the first round of voting on Oct. 2, Bolsonaro has baselessly claimed that voting machines will be rigged against him, an echo of former U.S. President Donald Trump's false claims about the 2020 election. Fred Magno/Getty Images hide caption
Peiter "Mudge" Zatko, former head of security at Twitter, testifies before the Senate Judiciary Committee on data security at Twitter, on Capitol Hill, September 13, 2022 in Washington, DC. Kevin Dietsch/Getty Images hide caption
Voters cast their ballots at a polling station set up in a fire station on Aug. 23 in Miami Beach, Fla. Joe Raedle/Getty Images hide caption
Boston Children's Hospital said it had received "threats of violence toward our clinicians and staff" after false claims were made online that the hospital provides genital surgeries to minors. Lane Turner/The Boston Globe via Getty Images hide caption
A jury has ordered conspiracy theorist Alex Jones to pay millions of dollars for spreading lies about the Sandy Hook school massacre. But his influence in right-wing media and politics remains strong. Matt York/AP hide caption
Facebook parent Meta's results are the latest sign of a protracted slowdown in the digital ad market. Noah Berger/AFP via Getty Images hide caption
Facebook is revamping its default feed to include more recommended posts and videos from strangers, picked by artificial intelligence. Facebook hide caption
Elon Musk's tweets mocking Twitter's lawsuit are displayed on a smartphone with Twitter logo in the background in this illustration photo taken on July 18, 2022. CHRIS DELMAS/AFP via Getty Images hide caption
Twitter's lawsuit sets the social media company and the world's richest man up for a lengthy, expensive and high-stakes battle. Soumyabrata Roy/NurPhoto via Getty Images; Patrick Pleul/picture alliance via Getty Images hide caption
Elon Musk and Twitter are accusing each other of breaking their legal agreement in the $44 billion sale of the social network to the billionaire. Patrick Pleul/AP hide caption