CEOs of Facebook, Twitter, Google face new grilling by Congress

As malicious conspiracy theories continue to spread, lawmakers are pounding the social media companies over their market dominance, harvesting of user data and practices that some believe actually encourage the spread of engaging but potentially harmful misinformation.

Facebook bans Holocaust denial, distortion posts

Facebook says it is banning posts that deny or distort the Holocaust and will start directing people to authoritative sources if they search for information about the Nazi genocide.