I recently came across a chilling article that spoke about the darker side of online communities ... 
 

So companies like Facebook and Twitter rely on an army of workers employed to soak up the worst of humanity in order to protect the rest of us. And there are legions of them—a vast, invisible pool of human labor. Hemanshu Nigam, the former chief security officer of MySpace who now runs online safety consultancy SSP Blue, estimates that the number of content moderators scrubbing the world’s social media sites, mobile apps, and cloud storage services runs to “well over 100,000”—that is, about twice the total head count of Google and nearly 14 times that of Facebook. ....

Companies would prefer not to acknowledge the hands-on effort required to curate our social media experiences, Roberts says. “It goes to our misunderstandings about the Internet and our view of technology as being somehow magically not human.” ....

In Manila, I meet Denise (not her real name), a psychologist who consults for two content-moderation firms in the Philippines. “It’s like PTSD,” she tells me as we sit in her office above one of the city’s perpetually snarled freeways. “There is a memory trace in their mind.” Denise and her team set up extensive monitoring systems for their clients. Employees are given a battery of psychological tests to determine their mental baseline, then interviewed and counseled regularly to minimize the effect of disturbing images. But even with the best counseling, staring into the heart of human darkness exacts a toll. Workers quit because they feel desensitized by the hours of pornography they watch each day​ . . . .

“I get really affected by bestiality with children,” she says. “I have to stop. I have to stop for a moment and loosen up, maybe go to Starbucks and have a coffee.” She laughs at the absurd juxtaposition of a horrific sex crime and an overpriced latte.

Constant exposure to videos like this has turned some of Maria’s coworkers intensely paranoid. Every day they see proof of the infinite variety of human depravity. They begin to suspect the worst of people they meet in real life, wondering what secrets their hard drives might hold. Two of Maria’s female coworkers have become so suspicious that they no longer leave their children with babysitters. They sometimes miss work because they can’t find someone they trust to take care of their kids.​