There are many forms of Internet Stalkers though. Especially on message forums
If you spend long enough as a member on a web forum you build up a map of how these people operate and can predict when they will post and in what manner.
I know several posters on Gaire for example who I can bet a years earnings that they will follow another poster around religiously quoting them and trying to get a rise out of them.
It's like .. X has just posted.. Y will be along any second.... There ye go
I suppose they have their reasons, regardless of how lame they are.