Mark Zuckerberg testifies before Congress - watch live

Facebook co-founder Mark Zuckerberg defends the social platform as a “positive force in the world” as he addresses Congress on Tuesday while admitting he made “a big mistake” by not taking seriously the social network’s responsibility to its two billion users Subscribe to Guardian News ► http://bit.ly/guardianwiressub Support the Guardian ► https://theguardian.com/supportus The Guardian ► https://www.theguardian.com The Guardian YouTube network: The Guardian ► www.youtube.com/theguardian Owen Jones talks ► http://bit.ly/subsowenjones Guardian Football ► http://is.gd/guardianfootball Guardian Sport ► http://bit.ly/GDNsport Guardian Culture ► http://is.gd/guardianculture Guardian Science and Tech ► http://is.gd/guardiantech