[marcosdumay]

Assuming they aren't selling this "boring" evaluation (or submitting to any other kind of pressure for making suboptimal decisions), keeping users reading their feed is still not necessarily what users want.

Facebook is doing what maximizes revenue, but there's no evidence that is the same thing that will encourage users to keep using it in the long term.

[jpalomaki]

That's a very good point that I did not think about. Even if they would be able to hit the right buttons in my mind to keep me browsing, I might find the overall experience dissatisfying and quit the whole thing. Like does anybody really feel "good" after spending one hour browsing Facebook or imgur?