Mainstream, meet internet: 216,019 people checked in to the Super Bowl last night on Foursquare and posted 338 photos.

The Superbowl appeared as a “Promoted Trending Topic,” an experiment in a new form of advertising for Foursquare. Users who posted their team could get a badge upon checking in (Dens: Packers; Naveen: Steelers).

Foursquare’s international userbase came out to play with people checking in from Japan, China and Thailand; Guangzhou user GummEr 木 is mayor.

ajeffries [at] observer.com | @adrjeffries

Adrianne Jeffries is the editor of Betabeat. Follow Adrianne on Twitter or via RSS. ajeffries@observer.com