Facebook, Twitter, and YouTube were pressed in the US Congress today over their reliance on artificial intelligence and algorithms to keep their powerful platforms clear of violent extremist posts.<br/>'<br/>In a Senate Commerce Committee hearing, executives of the<br/>world's top social media companies were praised for their efforts so far to eliminate Islamic State, Al-Qaeda and other content from the internet.<br/>'<br/>But critics also called for tougher actions as the extremist groups continue to get their propaganda out to followers via those platforms.<br/>'<br/>Clint Watts, an expert at the Foreign Policy Research Institute in the use of the internet by terror groups said, the Social media companies continue to get beat in part because they rely too heavily on technologists and technical detection to catch bad actors.<br/>'<br/>Senator Ben Nelson said, the current efforts being made by the companies to remove content and cooperate with each other in doing so are strong but not enough.