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.
E o que estava acontecendo era que o Facebook observava em quais 'links' eu clicava, e ele notava que, na verdade, Eu clicava mais nos 'links' dos meus amigos liberais do que nos 'links' dos meus amigos conservadores.