A person who spends too much time on social networking sites. (Note that although the word contains facebook, it really extends to any networking site (MySpace, Twitter, MSN, etc.)); Someone who must continuously check and re-check their accounts to see if a change has occured, or if a friend updates anything; this will get to a point where they schedule their day around their networking site …

https://www.urbandictionary.com/define.php?term=Facebook%20Zombie