I have made an earlier post for this but seems like its methods are already outdated so here is a new one. The name is Buddy Spy. It is an open source project that will even check if the person is in a chatroom. I have already tried it out and it really works! The only thing I don’t like about it is that it keeps a log of number of scans and the accounts you have scanned. Remember to hide this program or clear scan history just in case someone snoops the contents of your PC. You don’t want anyone to know who your spying on, do you?