Facebook, Twitter, Snap should be co-operatives of some sort, the users are creating the value, at least the popular ones, so they should be rewarded within the system for their continued support and audience development.
Now Facebook could turn into a paid service and pay its users more but then it would have much fewer users and then way less money to offer and now we're back to paying users little.
Seems like the current deal isn't such a bad one, Facebook connects a massive amount of people around the world including poor immigrants with their family (I know a few) and in exchange these users create value for Facebook. It's a voluntary win-win situation for both parties. Adults entering mutually beneficial deals with each others and enjoying it, what's wrong with that?
1: http://www.telegraph.co.uk/technology/facebook/11891353/How-...
The co-op concept doesn't require equal distribution of proceeds to participants. Nor does it require that the net distribution of proceeds equal the total value per user. Nor is incentivizing value creation on your platform a zero-sum game between facebook and content creators.