{you went from "in a relationship" to "it's complicated"}
Let's face it, sometimes these relationship status updates are just asking for trouble. Though it can make pretty interesting entertainment for the Facebook world, it certainly isn't so classy. Remember, you don't even have to put your relationship status on there at all. Or you can set it so that it doesn't appear in the news feed through your privacy settings. Also, informing your significant other that you are breaking up with them this way--definitely tacky. That's being said, those changing relationship statuses to the positive should be wary too. More on that later.
{facebook is not your therapy couch}
If you and your significant other are having issues, don't treat Facebook as your free therapist. Yes, your friends are on there, but not all of them need to know all the juicy details. DO talk to your close friends in person or on the phone if you need to, but don't go posting more drama or polls on who is right or wrong on the Internet. Even better, talk things out with your significant other like adults.
{tmi, pda, xxx, omg}
You're in love. You're in lust. Whatever. But the entire world doesn't need all the details. We don't need 100 photos of you and your lover smooching or to hear everything you did this weekend. Don't post the naughty photos your friend took of you. Don't leave an overload of mushy messages on your lover's wall for all to see. We don't need a complete description of why his or her body in the land of paradise either. Some things should just be special for the two of you to share.
{and here is my ex acting like the idiot he is}
Don't go posting photos, videos, or comments about your failed relationship. You may want to demonstrate that you're not the stupid one, but by acting that immaturely, you're showing you're in the same league. Keep the ex bashing to your close friends in private situations.
{we're engaged!}
Congratulations! You are so happy you feel like you want to scream it to the whole world. I remember, I was there too. But pause for a minute, do you really think your friend from 7th grade gym class should find out at the same time as your best friend? Your aunt? Through Facebook? Certain people should find out in person, over the phone, or even over text before you let the vast world of Facebook know or they will feel like they're unimportant to you. Hold off for a moment and make some phone calls, which should definitely include your parents. For your friends it is certainly appropriate to send a text letting them know the news if you don't have time for individual calls to all of them. I mean, after all, you might want to take in the moment with your fiance.