Almost intense...
A few years ago I knew a girl who I met online before I met in person. I have no idea how she got my MSN contact details, and that in itself was a weird thing which I never figured out (she lived in the same locale as I and I'm guessing somehow other people I knew did it).
Then, we got to chatting as you do, and since I'm a bit naive, friendly, and trusting, we got along well. Due to my qualities above though, I tended to not notice any weirdness she threw my way (though looking back now it was pretty obvious).
Eventually I met her IRL and damn, was she ugly. Not just looks, which might have been OK had she not had the absolute worst attitude to everybody I knew (except me because by then I figured she wanted me in some way or other). Still, back then I believed myself to be ugly, was a hormonal teenager, and also didn't have the guts to tell her to stop.
It was an extremely slow process for me to go from friendship (and yes, there was a hint of romance while it was strictly online) to hate. I often give people a chance to redeem themselves, but she never did. In fact, she started actively antagonizing all my friends (especially the female ones), and seemed to be going out of control.
I was incredibly relieved when she went to uni and I never heard from her again. Though I still get stories from friends about her vindictiveness from time to time. Looking back, she obviously had inferiority issues. I also think that maybe someone put her on to me in first place out of an act of spite??

Anyhoo, three or four years on and those questions are still unanswered. I just hope I *never* see her again.
(satellite blows, Wed 2 Aug 2006, 4:26, Reply)