The article is wrong. Facebook (and Google and Yahoo) isn't mostly white guys. It is mostly white and Asian guys. White representation in tech is not, by and large, larger than their percentage of the population at large. It is that Asians are vastly "over represented". These articles always lump Asians in with the white guys because they have no interest in pointing out that if your metric is proportional representation you are talking about getting rid of Asians.