Some people choose not to display their relationship status, some people do it loudly and proudly. And then there are those who not only display it loudly and proudly, but misuse it. Maybe they think its funny or cute or sassy, but really- its just freaking annoying. In particular are the people who display false 'Married' statuses, and even change their name to suit. I had one particular friend who did it for a whole day, and despite people actually congratulating her, didn't set the record straight. For what my opinion is worth, I find falsely claiming a particular relationship to be immature and just a bit pathetic. And all for a cheap laugh.
Another relationship status alteration that irks me, is the sudden change from "In a relationship" to "single" and back again countless times in the space of a week. Sure some people move on quickly or patch their relationships up, but personally I didn't display mine until both my partner and I were comfortable with it. At first we weren't even going to bother, since the people who mattered already knew and were happy for us. We brought it up in conversation a month or two after dismissing it and decided it might be a good idea. Besides, there is a setting for "its complicated" for a reason. So stop changing back and forward, you look desperate and easy (sometimes I even wondered if one person mistakenly changed it every time a guy bought her a drink... but that's another story!)
Finally, the 'its complicated' relationship status. If you have that displayed for more than a month, you're kidding yourself. It isn't complicated, you're just too naive to realise that he/she's just not into you, or that its over. And if you're so embarrassed at not being in a relationship, then just hide the status all together! Then no one knows whether you are or aren't in a relationship, but really, they probably don't care that much anyway!