I wonder if maybe the concept of a discussion forum is outdated, and we should move our asses over to Facebook, Twitter, YouTube, or some other social network.
Not exactly. Many websites message boards thrive with the help of these tools, but they are not good places for discussions, nor are they good places to centralize your audition room. YouTube attracts more idiots than anything else, and you can't require people to upload video when it will likely cost a good bit in sound quality even compared to mp3.
For instance, if I am in one of those periods where I'm not paying attention to PS and you update your status every time you upload something here, then you might attract me over here to comment. 'Oh, look! Chris has posted some Bach-whatever; I should go listen and see if I can find anything to nitpick about it.' Not that you care about my comments specifically; it would probably be the same for everyone you are connected to. Also, if you or anyone else were to do that via Twitter, you can set Facebook so that all Twitter updates show up in the Facebook feed.