We recently talked about the broad range of options available when deploying music download applications on Facebook or Twitter. This is an excellent example of a simple, yet effective, "Like-gated" music download application featured on CoverGirl's Facebook page at: http://meta2.us/nervo. The idea is to reward CoverGirl fans by allowing the first 5,000 who "Like" the page to stream and download the latest song from the dance music duo!