I use Yahoo Messenger all day to stay connecting with a few trading friends. Over the last few weeks I've seen some strange behaviour: Once in a while someone not in my friends list will be indicated as "logging off". The login name flashes briefly over the Yahoo Msg icon in the system tray, but the login never shows up in the main Yahoo Msg window. It's never someone I know. Am I being hacked ? To use Yahoo Messenger I need to allow it to access the internet in Zone Alarm, so in some sense I have a whole in my firewall. Any ideas?