A disease in which facebook takes over your life and you cannot do anything anymore besides look at your friends pictures and write on their walls.
Sever cases include times where your trying to get work or homework done on the computer, yet somehow you always find yourself on facebook, getting absolutely nothing done.
When one is repeatedly using "facebook" several hours a day. Always thinks about it over other things such as school and friends and family. Have a 1000 friends or more( so they think). OBSESSED