what is difficult, IMO, is the know whether or not you're seeing news that have been carefully curated for you, with some partisan motive - or if it's just some recommendation algorithm that's serving you stuff it thinks you will like.

I've seen some news sites that will seemingly push (news) content on the front-page that is aligned with the stuff you read most about. So if such a site only pushes, say, immigration crisis news - is it because you have a history of clicking on such articles, or is it some partisan news website that is pushing negative stories regarding immigration?