https://www.mercurynews.com/2019/10/10/trump-facebook-ads-biden-impeachment/

A controversial new ad from President Trump’s reelection campaign is the latest example of how Facebook has become the Wild West of political advertising.

The tech giant is refusing to take down a Trump ad that includes claims multiple fact-checkers have declared false and at least one major cable channel declined to run — sparking a debate over online misinformation and freedom of speech.