Twitter has released an analysis of tweets that breaks down the most popular teams by county using data scraped from its users' actions. It will come as no surprise that the New Orleans Saints dominate our neck of the woods. You can zoom in using this map to look at the percentages.
And it's hardly a surprise that the second-most popular team is the Dallas Cowboys (in all six South Mississippi counties except George County which maintains its Packers affinity, unlike Hancock County). The Cowboys still lays some claim to the title America's Team (despite not having won a playoff game since 1995).
The map also lets you play around and compare two teams. Here, the Saints and Panthers:
Twitter's map also shows many more rogue counties near regional powerhouses than Facebook's recently released map.