What is stalking on the internet?

My glib answer is if it's happened to you, you know it. It's unpleasant and works like IRL harassment.

For the not-so-glib answer I need to ask a whole bunch of questions:

For where you are anonymous:
*Do you use the same "handle" wherever you go, including chat rooms, discussion boards, blog comments, anywhere else like that, so that you are identifiable?
*Have you found someone deliberately speaking to you/addressing you, whether positively or negatively, in ways that you find unwelcome?
* Do they persist (either in the moment or over time) when you ask them to stop?

For when you are not anonymous:
* Is this someone you know IRL who knows your email address, etc?
* Is their attention, positive or negative, unwelcome for you?
* Have you tried to block this person and they keep trying to find ways to contact you through email/Facebook/Myspace/etc?
* Do they persist when you ask them to stop?

* Is this someone you don't know IRL, but who somehow knows you?
* Do they look for you on listserves, etc. and comment when you post to them, etc?
* Do they persist when you ask them to stop?

This is as thorough as I can be to answer your question, and of course I don't expect a response to the questions, think of them like a checklist. If you need other resources let me know and I'll post them.