Donald Trump's mastery in generating outrage on social media may have helped him stretch his campaign ad dollars in 2016. And Hillary Clinton isn't happy about it.

Donald Trump's mastery in generating outrage on social media may have helped him stretch his campaign ad dollars in 2016. And Hillary Clinton isn't happy about it. https://t.co/KDDRND7Kwz pic.twitter.com/QMetLdb1sP

— POLITICO (@politico) March 1, 2018