Engine: FaceBook

Via GoGo features: Viagogo enables a tickets application lets Facebook users easily view and manage their ticket listings on viagogo, the online live event ticket exchange. Once a Facebook user adds the application and links their Facebook and viagogo accounts, any ticket the user lists for sale on viagogo will automatically be displayed through the application on the user's Facebook profile.

You can now manage your ticket listings on viagogo, and add the list to your Facebook profile, where friends can see. Installing this particular application will automatically update changes made to your list, including price change and other updates.