Bit of a shame to target one person, but this article shows just how au courant everyone is becoming with the latest technologies and that they cannot be used to brag or have one over on someone. I don't understand why he advertised his day off, but he must have had his reasons and his capacity to accept being sprung is a little heretic, but he probably thought it was a normal response to such a situation. New technologies are creating new language uses so I wouldn't hold it too much against him that his response to a boss seems a bit too informal. I think that part of it was in good spirit. Why, oh why would you advertise like that? We all have an online profile and we need to be aware that people know it's there. I guess this one you look upon as a learning curve.