I was reading today about how to create good plot twists, and then it occurred to me that SL is great for unexpected twists and turns. Think about it, what's one of the most commonly heard stories in SL? Man meets the woman of his dreams and then finds out she's not really a woman. That's an unusually cruel plot twist. Something like that could damage a guy forever.
Or how about another common SL story, a woman finds her special prince and after a torrid few weeks he disappears. A couple of days later she get's an IM from someone professing to be his friend, who informs her of prince charming's sudden demise. The plot twist? The "friend" is really an alt of prince charming, who's simply been avoiding her.
You just never really know who's on the other side of those IMs. Could be anyone, maybe even a space alien that's using SL to study humans surreptitiously. That's my story.