As the 2016 election season went on, the topics and tone of the discussions in the closed group became increasingly hostile and heated.
Facebook didn't immediately respond to a request for comment.
On Wednesday, Facebook founder Mark Zuckerberg joined the growing ranks of media moguls to openly denounce the actions of alt-right ralliers over the weekend in Charlottesville, Virginia. Facebook's policies have long banned violent threats and hate speech, but the platform has sometimes struggled with enforcement. Zuckerberg specifically mentioned the events in Virginia. Zuckerberg said the company is "watching the situation closely and will take down threats of physical harm". "We won't always be flawless, but you have my commitment that we'll keep working to make Facebook a place where everyone can feel safe", he added.
But the WSJ report notes management's response to the FB Anon group "illustrates Facebook's struggle to cultivate open, freewheeling debate, while still following company rules of decency to not alienate employees with racist and sexist views" - and one casualty of the shutdown was another anonymous page for female and minority employees to discuss allegations of mistreatment at the company. But when someone tries to silence others or attacks them based on who they are or what they believe, that hurts us all and is unacceptable.
Following an anti-hate campaign by the AgainstHateSubreddits community, a Reddit spokesperson told Cnet: "We are very clear in our site terms of service that posting content that incites violence will get users banned from Reddit".
Two of the largest social media platforms are actively banning neo-Nazi hate groups following the "Unite the Right" rally in Charlottesville, Virginia, where one person was killed when a auto rammed through a crowd of counterprotesters.
"The last few days have been hard to process", Zuckerberg wrote. "I know a lot of us have been asking where this hate comes from", Zuckerberg added.