Facebooking around
When you reply to a post and the original poster 'likes' your reply, then they post their own reply, and the person you replied to 'likes' that too, like it’s some kind of dumb contest.
I said 'That’s a cool car,' and he 'liked' it, then he said 'Thanks,' and my friend 'liked' that too.
I commented on her post, she 'liked' it, then she posted a reply, and my friend 'liked' that.
I replied to his joke, he 'liked' it, then he replied to my reply, and my friend 'liked' that too.