My college used DC++ to internally share music, movies, tv shows, and porn. You could browse someones entire media collection. It gave you an overall sense for their taste in music and was a great way to find new bands. Reading about Napster reminded me how much I miss this feature.
The article glosses over how slow Napster '99 was. I remember waiting a couple hours to download an album. Fast downloads are more important than social features. I do not miss Napster.