Feeds decide what we will focus our attention on.
They allow us to sift through way, way more information.
This is a necessity in the modern world where we are inundated with more information.
But the tradeoff of a feed is that the entity deciding where to focus our attention doesn't work for us but rather a company who prefers we just keep watching the feed.
Having feeds also leads to more information being created.
Because we can now handle more information, more information is created.
Similar to the "equilibrium of misery" for traffic.
Add a new lane to a highway, and you get more traffic to absorb the capacity.