YouTube's new decision to make usage metrics publicly available give us a whole new trove of information to mine about how various political actors and messages are doing. This information--who’s watching your videos, geographic distribution, traffic flows and total views, ratings by users--has always been available to video publishers through YouTube's Insight tool. Now, if publishers choose to make that info public, we can see it too. Some examples of what you can find out: President Obama's special video message to the Iranian people on the Nowruz holiday, which has more than 600K views, was "most popular" in Iran: