There is no debate hotter than who has the best pizza. But which pizza chain is king across every state? Foursquare Swarm complied a list of the most popular pizza chains based on check-ins.

America's favorite pizza has been revealed, state-by-state. According to a TalkerResearch survey of 5,000 people across all 50 states in the U.S., Iowans are the ultimate pizza fans, with ...