Keen is a new social network from Google and the creators at Google Area 120. It's an experimental sort of system in which users can create a "Keen" with a set of keywords for their interests. These "Keens" automatically retrieve "resources" (webpages and articles and such) for the user at user-set intervals of time. You can also "collaborate" on a Keen. But what's all that mean, and why should you care?