https://www.cnbc.com/2018/02/27/facebook-says-trump-paid-more-than-clinton-to-reach-voters-in-2016.html

A Facebook executive who ran the company's advertising business during the 2016 U.S. election said Tuesday that President Trump paid more than Hillary Clinton to reach potential voters on the social media platform.

"After some discussion we've decided to share the CPM comparison on Trump campaign ads vs. Clinton campaign ads," Andrew Bosworth said

, referring to cost-per-1000-impressions, a typical measure of the price of a digital ad campaign.