Need I elaborate? Are you allowed to give a cookie to a nasty post? Are you expected to give one to a nice one? What are the social expectations with these cookies? I must know.
Do you know the give this man a cookie meme. Well in similar fashion giving one a cookie would be another form of winner rating, except tastier.
I mostly use it for people that need to vent out or calm down. Sort of like a treat for them in an attempt to I guess stop. It does mean whatever you want it to mean. It's mostly just a useless rating.
when someone is all serious and to the point, give them a cookie cause that's all their effort is worth