Who's who?

When viewing these threads, it's seldom clear whether some conversations are being carried on by a dozen respondents or simply a handful using various aliases. Fair enough, but how many people actually contribute to the site under two or more names?
I've been told that there are eight hundred plus "contributors", but how many does that boil down to in practice? I'll freely admit to using a rather silly pseudonym and a false ID for my poetry, so that's one off the total for a start.
It's astonishing, when you think about it, how many writers on the site actually use joky names.. why? Is it because the very nature of the net encourages people to remain anonymous? Okay, I used a fresh ID because I'd not written a poem for thirty years and thought my efforts might be laughed off the site - in which case, I didn't want their true authorship known. In fact, I shot myself in the foot by doing it, because when I got lucky recently and was named "Writer of the Week", nobody knew who'd actually written my poems and there was no extra interest in them.
What excuses do other people have - and how many of you out there will admit to using two or more names?

(Sits back and waits for a barrage of false claims and counter-claims.)