In principle, I've only got the one.
Although I suspect that the way I come across on line and the way I come across "in real life" are somewhat different - "in real life," I'm rather timid and shy around people I don't know, but online the keyboard and the screen act as rather nice buffers. Also, most of the time I try to remain fairly calm and stree-free, but occasionally I've been known to lose it. Not very often, by any means, but it happens.
So there you go - there are three of me.
On the bright side, none of me are the blue electric angels, so that's alright...