When people who are not engaged list their relationship status as 'engaged' on Facebook. I have tons of friends that do this. No. No matter how serious your relationship is, you're still 'in a relationship.' What's so wrong with that? Save the changed status for when you actually get engaged.
Back when I was a wee beebee, I had my status listed as engaged too. But then I got a swift kick in the behind from logic. If you already have your status listed as 'engaged,' what are you going to do when you're ACTUALLY engaged? Grr.
Now you go. What grinds your gears?
*Edited for grammar