I have a friend who has her own FB and twitter as well as one each for her dog, cat, unborn child and 2 year old.
I can semi understand the 2 year-old one if it was for family and filled with recent photos instead of constantly filling up her own feed. But I've had a friend request off her dog and cat. This was a couple of days ago. This morning I've woken up to a PM saying "said cat and dog are upset that I've not added them "