A Yahoo group I belong to has long been plagued by a troll. People are
always posting about what horrible thing she's done now and how we
really ought to do something to get rid of her. She eats this up.
Last year she started taunting people through IMs. There were numerous
posts on the list about the horrible things she's done through IMs and
how she just won't leave people alone.

She IMd me a few months ago. I ignored her. After only three tries,
she went away and I haven't heard from her since.

-Anna