What matters is the interaction between the user and the news system. For this reason, I don't believe the comparison with a shop, tv or a magazine is pertinent

What matters is the interaction between the user and the news system. For this reason, I don't believe the comparison with a shop, tv or a magazine is pertinent. IMO the key element is that the news system should never lock the user up. The most annoying thing with personalized filters is that they're mostly invisible.