"Harassment" can refer to a variety of behaviors. I feel "harassed" by telemarketers insisting I apply for a loan or buy whatever they're selling. If someone were to repeatedly bother me at the mall trying to sell me something, I'd think of that as them "harassing" me to buy something etc. Harassing seems to me like repeatedly being a nuisance.

In the context of criminal behavior I'd expect harassment to be a campaign of intentionally bothering someone and invading their space. I'd assume someone like Lin might be guilty of criminal harassment if he waited outside this girl's house and lewdly propositioned her every day, bothered her at work, etc.

I think we should have a higher bar for what constitutes cyberharassment because it's so much less invasive and threatening than physical harassment and so much easier to ignore. It's also possible that it's easier to inadvertently participate in cyberharassment when you can't see how the other person is reacting to you or feel how inappropriate the behavior is.

What Lin did in this case is far beyond any of what I described above. I think of his behavior as transcending what I'd describe as cyberharassment - in my earlier comment I called it psychological torture and I think that's far more apt than cyberharassment which seems too milquetoast a phrase for what happened here.