I've been online for around 25 years and figured I know most of the nasty stuff going on.
But that documentary made me question my understanding of the Internet and had me realize how much of our "reality" is nowadays mostly perceived and shaped through social media. If it doesn't exist on social media, it might as well never have happened.
To give one of the worst examples: Pictures of "enhanced interrogations", performed by US soldiers on "terrorist suspects", are being deleted from social media with the reasoning "This is a known torture method by ISIS, deleted for being terrorist propaganda" because these Phillipino moderators, many just young students, often completely lack any real context or understanding of what they see.