How is technology being used to track Black Lives Matter protestors?

We've probably all heard the phrase 'Big Brother is watching you' (a reference to the fictional character in George Orwell's dystopian novel '1984') - but are we really under constant surveillance? Is it actually possible to be a fully functioning member of modern society without being tracked by some sort of surveillance system? And how is technology being used to track protestors - such as those involved in the Black Lives Matter demonstrations? We catch up with Anjuli Shere, from Oxford's Department of Computer Science and Channel 4's show 'Hunted', to find out. Find out more on this topic with Simone Browne, Shoshana Zuboff and Ken Klippenstein.