to demand wages for facebook does not mean to say that if we are paid we will continue to do it. It means precisely the opposite.
While this is meant rhetorically - as in, the proposition that we should be getting paid to use social media and the inevitable refusal of such payment should turn us off of "working for free" , there's actually a psychological phenomenon about how getting paid to do something makes us enjoy it less. This is because your reward structure sees happy feelings replaced by currency.