I'm not sure most people lose sleep over being defriended on Facebook . . . it's like, "Oh no, my old coworker from 1998 doesn't want to look at my vacation photos anymore!  How will I survive?"

--But if you do worry about it, researchers at Arizona State University used focus groups and studies to come up with these ten SCIENTIFICALLY-PROVEN rules to keep people from defriending you on Facebook.  Check 'em out . . .

#1.)  Return the favor.  When someone posts on your wall or comments on your photo, you're expected to respond.

#2.)  No disrespectful postings.  You shouldn't publicly write anything negative on Facebook about one of your friends.

#3.)  Think before you post.  Think about the negative impact a post could have on someone.  Like, if a friend of yours is home on workers' comp, don't post a photo of him wrestling a bear.

#4.)  Don't repost.  If someone deletes something you posted on their wall or untags a photo, don't repost it.

#5.)  Don't rely on Facebook to replace real communication.  You should tell your real friends big news before you post it on Facebook.  Like whether you're pregnant.

#6.)  Be honest.

#7.)  Don't be an addict.  Don't be the person who posts so much that it becomes over the top.

#8.)  Protect yourself.  Don't post information that could be used against you.

#9.)  Use common sense.  Think before you post . . . your friends don't want to feel bad for you because you post something incredibly stupid, like negative information about your boss, or a photo of you committing a crime.

#10.)  Don't put your friends' jobs in jeopardy.  Think about how your friend will look to their boss or a potential employer before you post something potentially-damaging on their wall.

(LiveScience)