The saying goes if you’re not the customer, you’re the product. Now, you’re both. Every big social media app is testing subscriptions. It's a business model that comes with a perverse incentive. Just like airlines, if you make life worse, more people will pay.
I completely disagree with your definition of “media.” There is definitely plenty of media that isn’t about celebrity, and there is also non-profit media. Media actually refers to communication to the masses. A social network is simply one form of social media.
Then what would be a good way describe this difference
What difference?