I could not help but use the word Freemium in the headline to this post. For those that don’t know, the word Freemium was invented here at AVC, back in 2006. I am quite proud of that fact, even though I did not come up with the word myself. With that business taken care of, let’s move on to the topic of the day. Our portfolio company Stack Overflow, best know for its massive free knowledge sharing service for programmers, has been building a companion business over the last few years called S...