That's a very different problem in a very different league of problems. Where do you click to see the stuff the New York Times decided not to show you? Or scenes a movie editor left on the cutting room floor? Or pages an author never sent to print? Or words I left untyped in this comment?

Content editors and curators have existed for a long time.

But they weren't automated and couldn't tailor the content for each user individually to maximize the time they spend looking at ads.

There used to be Facebook lists (NOT groups, lists are a private sorting friends can’t see). I would make a list of friends I most want to follow and open just that list. But that feature seems gone (I also used list to limit friends visibility and access to my wall... honestly google plus has this right)

Facebook still has lists. It's a little convoluted and only really works well from a desktop/laptop browser, but they're there.

I had a list I really liked that just disappeared recently. I think he's right that they removed the feature.