[rm999]

Cool analysis, but the results seem off to me based on my own social network (which line up with a lot of common stereotypes).

I think I know why. The majority of people I know who have cats don't post photos of their cats on social media, but it's pretty mainstream to post photos of a dog. This reflects social habits with pets in general: at work the dog people regularly talk about their dogs, e.g. how they took them to the park on Saturday. I rarely hear any discussion about cats at work even though I know more of my coworkers own them.

I think this leads to an "alternative", quirky, less social bias on the cat people. There's probably some bias on the dog people, but I imagine far less of one.