Pigeons and humans share are more similar to each other as you’d think. Facebook has built its like button such that it resembles a famous experiment done with pigeons in 1971. (Yes it sounds awkward and it kinda is)
I read for a full 5 minutes and the author had not said anything substantive, just their own thoughts about pigeon love based on some pigeons he saw in his backyard once. Ok.
http://alter-agency.com/2017/03/23/addicted-to-likes/