Alan Travis, home affairs editor, The Guardian:  “The five biggest internet companies in the world, including Google and Facebook, have privately delivered a thinly veiled warning to the home secretary, Theresa May, that they will not voluntarily co-operate with the “snooper’s charter”. In a leaked letter to the home secretary that is also signed by Twitter, Microsoft and Yahoo!, the web’s “big five” say that May’s rewritten proposals to track everybody’s email, internet and social media use remain “expensive to implement and highly contentious”.”