Even Republican presidential hopeful Donald Trump, who once called data “overrated” as a political tool, appears to have seen the light. One day in August, his campaign sprayed ads at Facebook users that led to 100,000 different webpages, each micro-targeted at a different segment of voters, said Brad Parscale, Mr. Trump’s digital director and head of San Antonio-based digital advertising firm Giles-Parscale. Hillary Clinton’s campaign is using similar tactics, said a campaign official.
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