As a Facebook user, why exactly do I want to see a notification about each and every song that 100 different friends are listening to at any given point in the

As a Facebook user, why exactly do I want to see a notification about each and every song that 100 different friends are listening to at any given point in the day? Add in the fact that Rdio does the exact same thing (spam my Facebook "ticker"), and it's even more ridiculous.