https://www.theguardian.com/technology/2018/mar/27/mark-zuckerberg-testify-congress-cambridge-analytica-data-scandal >Calls for CEO to appear reach fever pitch after Cambridge Analytica reports, paving way for showdown over Facebook accountability >Facebook’s chief executive, Mark Zuckerberg, has agreed to testify before the United States congress in the wake of a data harvesting scandal that has sent the company’s share price tumbling and prompted numerous investigations and lawsuits.