Booze brand Finnegans has launched an iPhone app that makes innovative use of social location and payments features, rather than simply plugging its brand.

The app is called Finnegans Beer It Forward. Here’s how it’s described on the App Store: “Beer it Forward loads your friends’ recent Foursquare check-ins, and lets you send money to them via PayPal to buy a Finnegans in an instant. Be sure to suggest they try the brand new Blonde Lager!”

There’s also a charitable element: profits from sales go to the Emergency Foodshelf Network’s Harvest for the Hungry program. The company worked with ‘social money app’ startup Schmoney on the app, which is seemingly focused on the US (although it’s available in the UK App Store too).