FACEBOOK RAPE. or FRAPE. 
"the access of a Facebook account by a third party, unknown to the account's owner, which alters and adds humiliating or otherwise derogatory words to the account's profile for the purpose of a prank. The act usually takes place between friends after one leaves their Facebook account logged in." - Urban Dictionary
A horrible but perfect example. Thanks Ebaumsworld.
This also shows how Facebook "friends" are not real friends. The above example shows a horrible and extreme "Frape" but the reaction from this guys friends, who should know him well enough to see this isn't really him, instantly start to attack him.
"Frape is at best defamation of character and at worst a form of identity theft as Facebook has in a very real way become an extension of the self."

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I read this on a blog and it's spot on. If Facebook is the latest extension of the self, then FRAPE can damage lives. Obviously it would be idiotic to compare the act to rape, and that's what makes the term so offensive. 
But people take Facebook so seriously, changing your FB status is a big deal, if you haven't put 'in a relationship' then to some people you aren't, no matter how long you've been with someone. What you say on there matters, whether we like it or not, people will use FB against you one way or another. 

You have to take it seriously, you have to treat it like real life, because it is.