As I said before, with this feature being completely anonymous, the unfortunate side effect is that if for some reason, however stupid it may seem to rest of US (as it generally does), if a person can't get to someone in any other way they've tried, they go for this. The most common reason I've seen, is because a writer writes a particular pair, and since the ones who would've started flaming all the stories for the pair have learnt that they pull that, I'll delete 'em, they use this as a harassment option, going after authors and all their stories. Like I said, stupid reason, but the most common one for this sort of behavior.
Send me a pm please or I will forget to look at 'em all again for you.