By using cash, taking public transport, using a pre-paid mobile and avoiding the internet most of your movements will go unseen.

You will not fade away entirely, but the time and trouble it will take someone to find out what you have been doing will make you a lot less visible.

But on the net, almost no matter what you do, you leave behind scraps of information about what you have been doing.

Information about the computer you are using, the sites you visit, where files were downloaded to and information you type into forms will be noted.

If you take no precautions in the offline world, you may leave the same scraps but they are harder to piece together, search through and compare.

On the net, by contrast, it is relatively straightforward.

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