> I am fan of adding randomization. It was previously proposed: show few random new items on a front page in random places, maybe with a little threshold.

We tested this idea (though we didn't roll it out for everyone) and the results were terrible. The median story is too low in quality for randomness to add value here. You just end up planting junk on the front page and annoying people. From that we concluded that there needs to be additional filtering, be it by algorithms, humans, or a combination.