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.
O que realmente se passava era que o Facebook andava a ver em que ligações eu clicava, e reparou que eu clicava mais nas ligações dos meus amigos liberais do que nos de amigos conservadores.