Cats in general seem to have Introvert / Fi / N temperaments. My only irl experience with cats involved both of them minding their own business throughout the house but checking me out as a stranger in the household, and on one of those times one cat finally came over to me to be petted. That's nothing like what most young dogs do, which is to be all in your face and sniffing you and wagging their tails happily etc if they're untrained they'll jump on you.
This facebook research seems horribly skewed but still it's obvious why nerds and geeks turn to cats, cats are the opposite of overbearing which is what such social outcasts have always been running away from in society. Their wily personalities and exotic appearance can serve a muse to the introvert.
Dogs have the loner's companion stereotype as well but it seems that may be a forgotten and outdated archetype. In general though dogs are more socially popular and accepted(a grown man with a cat??
) despite what the internet depicts, so you have to account for that disparity. I believe the research should be "what do watcher's of anime and cartoons prefer as pets" rather than "what do owners of dogs watch vs owners of cats".