Why they overlooked a tech-centric city like Austin in lieu of San Antonio is beyond me, but Twitter made a huge move yesterday when they announced the roll-out of Local Trends.

Obviously the list of available cities is pretty small right now (Twitter’s made Local Trending available for 13 US cities and 2 international cities, Sao Paulo and London), but it’s safe to say Local Trending will be coming live to a city near you very soon.

This should be especially interesting tonight after Obama’s State of the Union Address when you’re looking to see how different parts of the country (or world, you can access Local Trending for 7 countries including the US) are reacting to the speech.