It’s here: Facebook files for $5 billion IPO

The most highly anticipated initial public offering in today’s tech world is officially happening. Facebook filed S-1 documents with the Securities and Exchange Commission Wednesday afternoon to raise a maximum of $5 billion. According to the filing, Facebook made $3.7 billion in revenue in 2011.

How Codecademy got so hot, so fast

Codecademy, which teaches users how to program for free with an interactive and social web application, has garnered more than 1 million users in less than five months. We talked to co-founder and CEO Zach Sims about how Codecademy started and where it’s going.