Blaming Social Networks

Are social networks to blame for declining music sales? Some musicians like Billy Brag seem to think so, even though some say that the judgment of musicians like Billy Brag is clouded by the motive to make money, as opposed to logical argumentation. I think that most experts agree that the decline of music sales is associated with the fact that music can be reproduced at zero cost. It seems it is economics that drives this phenomena, not social networks. Social networks are merely a tool that can be used for good or bad. We have to also take into account young artists who now have a way to break into the mainstream without getting a label to promote them. That is because they can distribute their music very easily through social networks.