WaPo:

Facebook has constrained its efforts against false and misleading news, adopted a policy explicitly allowing politicians to lie, and even altered its news feed algorithm to neutralize claims that it was biased against conservative publishers, according to more than a dozen former and current employees and previously unreported documents obtained by The Washington Post. One of the documents shows it began as far back as 2015, when as a candidate Trump posted a video calling for a ban of Muslims entering the United States. Facebook’s executives declined to remove it, setting in motion an exception for political discourse.

The concessions to Trump have led to a transformation of the world’s information battlefield. They paved the way for a growing list of digitally savvy politicians to repeatedly push out misinformation and incendiary political language to billions of people. It has complicated the public understanding of major events such as the pandemic and the protest movement, as well as contributed to polarization.

And as Trump grew in power, the fear of his wrath pushed Facebook into more deferential behavior toward its growing number of right-leaning users, tilting the balance of news people see on the network, according to the current and former employees.

Facebook is now confronting a mounting advertiser boycott that has pushed down its stock price as companies demand stricter policies against hate speech. Starbucks became the latest on Sunday to say it would hit pause on social media advertising.