plutil -p /Library/Preferences/com.apple.preferences.accounts.plist shows some deleted usernames that I am in the same school with. Am I hacked by them?? I am really concerned.
Since we are in the same school, we are connected to the same network which is protected by mac address registration. I have done some research on the names of the deleted users and they are not the "hacking type". It is also possible that someone else used their name to create the accounts. I am still looking into other files to find some clues.