I have a contact which I think has been offline or invisible for a couple of days. What does last activity actually mean? Does it mean when I last logged in and messaged my contact? That would be right as my last message to him and last was 10 hours ago. As for last seen, I just downloaded Skype onto my computer for the first time, logged in and it said my exact log in time. I'm just confused, does last seen and activity refer to my contact or to me?