Jim Steyer: the man who took on Mark Zuckerberg

With 800 firms now joining the Facebook advertising boycott, the man whose idea it was explains how the company could easily clean up its act

With more than two billion users Facebook is bigger than Christianity," says Stanford law professor Jim Steyer. Their ability to amplify hate speech or white supremacy or racist messages is so extraordinary because of the scale of the platform."

It's a typically bold statement from the man who set up the Stop Hate for Profit (SHFP) campaign calling on advertisers to withdraw from Facebook for the month of July. More than 500 firms have joined the temporary boycott, including Coca-Cola, Adidas and Unilever.