https://www.cnbc.com/2018/11/16/senators-question-facebook-on-definers-public-affairs.html

Several U.S senators on Friday pressed Facebook for answers related to claims the company hired contractors to "retaliate against or spread intentionally inflammatory information about their critics," according to a letter addressed to Facebook CEO Mark Zuckerberg.

"We are gravely concerned by recent reports indicating that your company used contractors to retaliate against or spread intentionally inflammatory information about your critics," the letter reads. "Both elected officials and the general public have rightfully questioned whether Facebook is capable of regulating its own conduct."