Left-leaning organizations are dominating political ads on Facebook and Twitter while rightwing advertisers are outspending liberal groups on Google, according to new research.
Computer scientists at the New York University (NYU) Tandon School of Engineering analyzed more than 884,000 recent political ads on the three social media sites. They found that Donald Trump and his Make America Great Again political action committee had the largest number of ads of any candidate while a Republican group called the Senate Leadership Fund spent the most on ads.
https://www.theguardian.com/media/2018/oct/15/political-ads-study-google-facebook-twitter