I haven't ever done it so maybe I'm not getting it but I often see posts on here start along the lines of "I've NC for this one. Potentially Outing" and then launch into the longest of stories that goes into the most minute detail that anyone even vaguely involved would recognise it and think "Oh hang on, that's so and so". Especially if they know their friends/family/colleagues use the site and know there is the ability to namechange and knows the OP has when their opening sentence announces that they've done so. What's the point?