The rules one must follow while Skyping, these rules however vary by generation. For instance those from the 80's and early 90's believe that forgetting you had a chat window open and leaving in-promptly to be ok and an honest mistake. Their parents generations IE the 40's and 50's have no grounds in instant messaging or talking via a webcam and believe that leaving while in the midst of a chat to be rude, probably because they are only chatting with one person. There are several other rules that vary by generation.
Mother: Why did you leave our skype chat? That's bad skype etiquette.
Son: Forgot we were chatting. What the hell's skype etiquette?