If you’re a Facebook user with a few hundred friends, it’s extremely difficult to keep track of all of them. And sometimes, you’ll be unfriended – it’s just a sad fact of life. Whether you piss someone off or simply …

Facebook users will be familiar with the New Oxford American Dictionary’s 2009 Word of the Year, "unfriend."

Oxford says the term unfriend is a verb. Its definition of the word is "To remove someone as a friend on a social networking site such as Facebook."