When you write a comment, it's really OBVIOUS that you endorse it, you don't need to "Like" it as well to... ah why do I even bother, I'm sure no matter how good I explain this to you, you will NEVER get it, because hey, you are the type of people that like their own comments after all!
people that like their own comment are on the same level of people that insert weird stuff in their butts just to see how it feels, you just can't argue with those people, unless you want to have brain damage from the conversation.