Can the Big Four - Amazon, Google, Facebook and Apple - be reined in and forced to play by the rules society sets, rather than imposing their own standards on society? It seems like news breaks every few weeks that reveal how the technology on which we increasingly depend - smartphones, search engines, social media - is not as passive as many of us thought. Big data, fake news, extremism, Russian trolls: with little or no regulatory supervision, the big tech companies are changing the world and disrupting our lives. Yet governments seem to have little power to respond. The tech giants look too big, too international and too hard to pin down.

So is it time to disrupt the disrupters? Journalist and writer Jamie Bartlett asks how we can regulate big tech. He meets the regulators who are daring to reclaim power, and assesses the challenges involved in imposing rules on an industry which is deeply complicated, ever changing and supranational. Do governments have the resources to reassert sovereignty over something which has become so embedded in our culture? And how would society change if they did?

Producer: Gemma Newby.