The chief executive of Facebook, Mark Zuckerberg, has remained silent over the more than 48 hours since the Observer revealed the harvesting of 50 million users’ personal data, even as his company is buffeted by mounting calls for investigation and regulation, falling stock prices and a social media campaign to #DeleteFacebook.  Facebook’s shares slid 6.77% on Monday following the news,

knocking $36bn off the company’s valuation as investors worried about the consequences of the revelations. Zuckerberg owns 16% of the company and personally saw his fortune fall $5.5bn to $69bn, according to Forbes’ live tracker of the world’s wealthiest people. The embattled social media company announced on Monday that it will engage a digital forensics to conduct an audit of Cambridge Analytica to determine whether or not the firm still has copies of the data in question. READ MORE