The Eventful C# SDK by Faruk GÜNGÖR allows developers to integrate the Eventful API into their C# applications. By default, the SDK returns 20 events for the current month with an option to filter results by location.
There have been a lot of new socially based mashups showing up recently. In fact, we recently topped 700 social mashups. While many of these use the Facebook API or Twitter API, there are many more social APIs. The mashups below run the gamut, though, yes, also include Facebook.