Twitter is a network that is used by 150 million people. It is embedded deeply into thousands of software systems. Millions of people consider it an important p

Twitter is a network that is used by 150 million people. It is embedded deeply into thousands of software systems. Millions of people consider it an important part of daily life - maybe more important than things like newspaper and cable TV. Every day, Twitter publishes (and collects) something like 50m tweets, and their database contains maybe the best record of what's happened in the digital world in the last few years. That's unique.