If the OP can't answer this question, why does he/she come to the forum and post it here? A stalker doesn't come around the corner and think "Hell YES, that little Lala with the B2 boots is my next target".
In 98% of cases, something has already happened that has led to this stalking. And in most cases, the perpetrator and the victim know each other.
Unless you're a celebrity, there are a lot of sick people around the corner for a lot of different reasons. But I'm assuming that this isn't the case here.
I think that a lot of people use the word "stalker" even though there is no stalking going on. As a misinterpretation.
The best example is someone we all know, Zenos. How many people here in the forums have claimed that he is a stalker and that they've had enough of him?
He's just an NPC and he's never shown up at my door or followed me to stalk me. <sad face>