That is proof of nothing. If the stereotype that "only old people are on Facebook" is true, and old people tend to be more right leaning, then it would follow t

That is proof of nothing. If the stereotype that "only old people are on Facebook" is true, and old people tend to be more right leaning, then it would follow that the top posts ranked by # likes or # views would skew toward their interests even with a completely neutral ranking scheme.