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How Facebook fueled Trump's campaign

Brad Parscale and Lesley Stahl / CBS News

Brad Parscale, the Trump campaign's digital director, tells Lesley Stahl on tonight's "60 Minutes" that the campaign averaged 50,000 to 60,000 different Facebook ad versions every day, some days peaking at 100,000 separate iterations (with minute shifts in design, colors, backgrounds, words).