Social media users now number more than 1.4 billion - more than half of the Earth's Internet-using population. We share a lot of information on social media, but it turns out we are sharing far more than we think. Seemingly innocuous information, when analyzed against tens of thousands of other profiles, can reveal secrets you never intended to share.

Many linguists, including Noam Chomsky, contend that language in the sense we ordinary think of it, in the sense that people in Germany speak German, is a historical or social or political notion, rather than a scientific one. For example, German and Dutch are much closer to one another than various dialects of Chinese are.