And what it turned out was going on was that Facebook was looking at which links I clicked on, and it was noticing that, actually, I was clicking more on my liberal friends' links than on my conservative friends' links.
Og det som viste seg å være årsaken var at Facebook registrerte hvilke lenker jeg klikket på, og la merke til at jeg faktisk klikket mer på mine liberale venners lenker enn mine konservative venners lenker.