I ate up studies (from Facebook and others) that argued the site actually encouraged a certain
kind of information diversity, because your Facebook friends are likely drawn from a
wider group
of people (the guy you went to middle school with, your
mom's neighbor, that rando you met that weekend at the beach) than the people you discuss news with in real life.
Presumably these choices are agonized over and debated at length behind the scenes since they're always so carefully representative
of a
wide range
of celebrities appealing to all
kinds of mainstream moviegoers from kids to grandparents to sophisticated cultural mavens to soccer
moms.