London Mayor Sadiq Khan: Tech companies need a 'greater duty of care'

Social media is "fantastic," but it needs more control not only from the tech companies themselves but also from policymakers. 

That was the message from London Mayor Sadiq Khan, who attended the South by Southwest conference last week, and it's even gotten more attention given Facebook's ongoing scandal with data company Cambridge Analytica. 

The mayor, who assumed office in May 2016, is not naive to the power of technology. He was speaking at SXSW, after all, and prior to our interview his eyes were glued to his phone.