But if there are others with malicious intent who lurk here, couldn't they start a database of all these "fun" posts, and perhaps by a sort of trianglation of crossfire, nail someone's identity? Unlikely, I'm sure, but still a possibility?
Anything's possible but that would be far too much work and too orwellian, even for the average dub. And the higher up you go, the less concerned they are with individuals, in most organizations. So it's rather unlikely to be "outed" that way. More likely by befriending a poster under false pretenses.
It's always good policy to limit personal info on the web in general and be vague in direct contact until time and trials say otherwise. If of course, you've something to lose.