http://www.washingtonpost.com/blogs/the-switch/wp/2017/08/17/facebook-shut-down-anonymous-employee-group-after-trump-was-elected-report-says/

Facebook chief executive Mark Zuckerberg shut down an anonymous employee group following the election of Donald Trump, after it devolved into a forum for divisive political commentary that alarmed management, according to a report by Business Insider.

Named Facebook Anon, the group was formed in March 2015 as a side project by some employees and hosted innocuous discussions about office culture and workplace gripes. But in the months leading up to the 2016 presidential election, the group's discussions became more political and more hostile.