We all have a right to privacy, but this is gradually being eroded. Last year in America, Congress decided that the Fourth Amendment, which states the need for a warrant to search for specific things, does not apply to non-US citizens' personal data. That is 95 per cent of the world's population. Moreover, thinking "I've got nothing to hide" is based on a presumption that we are guilty until proven innocent. It puts us on the defensive. Once the invasion into our privacy becomes visible, people start to behave in a very specific way, not just on mobile phones, but on computers. It erodes the breadth of our searches, what we think, our focus, our actions and the ideas we have. When we are necessarily limiting ourselves in this way, freedom of speech becomes pointless, since freedom of thought has been destroyed.