Our use of mobile electronic devices means that we are now more easily tracked than ever before. But who exactly has this information? Well, Facebook, for one. Every time you log into your account, Facebook records your location – though not very accurately, as this article in ITWorld points out.

And our mobile phone companies are tracking us too – watch Malte Spitz's TED talk on what he found out after he examined all the data his German mobile phone company had been keeping on him.