The artist Ai Weiwei knows a thing or two about government surveillance and privacy intrusions, and has recently written an article for The Guardian, "NSA Surveillance: The US is behaving like China".
"I lived in the United States for 12 years. This abuse of state power goes totally against my understanding of what it means to be a civilised society, and it will be shocking for me if American citizens allow this to continue. The US has a great tradition of individualism and privacy and has long been a centre for free thinking and creativity as a result.
In our experience in China, basically there is no privacy at all – that is why China is far behind the world in important respects: even though it has become so rich, it trails behind in terms of passion, imagination and creativity.
The internet and social media give us new possibilities of exploring ourselves.
But we have never exposed ourselves in this way before, and it makes us vulnerable if anyone chooses to use it against us. Any information or communication could put young people under the surveillance of the state. Very often, when oppressive states arrest people, they have that information in their hands. It can be used as a way of controlling you, to tell you: we know exactly what you're thinking or doing. It can drive people to madness".