Mark Zuckerberg announced Donald Trump has been blocked from using the social media platforms "indefinitely and at least for the next two weeks".
A decision not to ban Steve Bannon has prompted anger from users of the social media site who say they've been barred for innocuous posts.
Trump's ally says the president can bust Mark Zuckerberg, Tim Cook, the "Clintons" and others who oppose him.
Twitter warned that the president's messages are "glorifying violence." Facebook remains silent.
When asked about Twitter's fact-checking of Trump, Zuckerberg said Facebook shouldn’t be “the arbiter of truth.”
Will Facebook follow?
The freshman lawmaker had the Facebook CEO drawing blanks during a congressional hearing.
The company is worth over 100 times that amount.
The social media giant is facing a multibillion-dollar fine over its role in the Cambridge Analytica data scandal.
Mark Zuckerberg’s power is "unprecedented and un-American,” Chris Hughes wrote.