I did sort of use this type of thing last year. My exboyfriend and I broke up kind of suddenly (or it seemed to me) and it actually took a few people that were close to me and knew just how badly we were doing by surprise. Someone who knew I was supposed to be hanging out with him that day texted me and asked how it was going. It hurt, a lot, to be reminded that day. We'd been down for so long I knew it was pretty final, so I changed my facebook status (since he didn't have one, so I was listed as married to a friend of mine because the half of my school that wasn't under the impression that I was glued to the hip with my ex thought that friend and I were dating, and we were amused since he'd come out freshman year.) to "Kandikrisp is single..."
I had a few people text and asked what had happened, and the rest of my friends just let it go. Once word spread, everyone knew that ex was *not* a subject to be discussed without me having to go over it a thousand times, and putting people in the awkward position of asking, "How's it going with BF?" and then feeling like they put their foot in their mouth when I discussed the newly added "ex" prefix to his title.
I'm aware that it's something that some people wouldn't totally approve of, but I do think that it's something that works for making it known and let go.