I was prompted to start another thread reading through the Spotify thread. In it some posters expressed distaste for having their Facebook feed cluttered by automated updates as to what others are listening to, not to mention having their own material broadcast to all and sundry.
I agree with those sentiments. It's even more pertinent to the growing trend of social reading, or frictionless sharing as Mark Zuckerberg terms it. Rather than poorly regurgitate what's already been said by more knowledgable people, here are a couple of links: one to a short report and the other to a more extensive PDF which I encourage you to read if this sort of thing is of interest to you. I learned a few things, important things that I suggest we need to be aware of if our intellectual freedom is to be preserved.
The short report
The academic paper