Creating an account for non-human entities.
This. Needs. To. Die. There are few things stranger than getting a friend request from someone named Sylvester, having a last name that's the same as a friend's, only to find out that it's a Facebook profile for their pet goldfish.
No one cares. The thing about social media is that it's geared toward connecting people, not people to creatures they can't have a human relationship of any kind with.
And besides, there's a good chance that outside of you and your family, no one has made a meaningful connection with your cat, or your dog, or your gerbil. So it's really a pretty silly exercise.
That and it's against Facebook's rules to make a profile for non-human entities, like pets or businesses. Instagram, however, is an awesome place for doing this.