As Europe readies for several elections this year after President Trump’s victory in the United States, Mr. Vlachos, 36, is one of a growing number of technology experts worldwide who are harnessing their skills to tackle misinformation online.

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The French electorate heads to the polls in the second round of presidential elections on May 7, followed by votes in Britain and Germany in the coming months. Computer scientists, tech giants and start-ups are using sophisticated algorithms and reams of online data to quickly — and automatically — spot fake news faster than traditional fact-checking groups can.