As it is now you can still like post in a closed thread. Maybe it is just me but if the thread was closed should post in that thread still be able to be liked? To me if the thread is closed likes should be turned off. If the thread is closed and people continue to like the thread, thats kind of like people Liking to not liking your forum rules. Overriding that your moderator closed your thread. Plus it seems to make the user think its ok to break the rules as people kept liking the thread after it was closed.