我们发推文、点赞、分享 — 但日益依赖社交媒体会带来什么后果？随着数字平台日益成为人们保持联系的重要方式，硅谷内部人士通过暴露屏幕另一侧的隐藏内容，揭示了社交媒体如何重新改写文明。

Twenty-five years after the world wide web was created, it is now caught in the greatest controversy of its existence: surveillance.
With many concerned that governments and corporations can monitor our every move, Horizon meets the hackers and scientists whose technology is fighting back. It is a controversial technology, and some law enforcement officers believe it is leading to 'risk-free crime' on the 'dark web' - a place where almost anything can be bought, from guns and drugs to credit card details.
Featuring interviews with the inventor of the world wide web, Sir Tim Berners-Lee, and the co-founder of WikiLeaks, Julian Assange, Horizon delves inside the 'dark web'