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Even though most are observers, stalking done on a more intense level seems to lead to homicide in most cases. I've read a lot of stories about a person watching another, learning everything they can about them, and getting so caught up in that other's life that they feel the need to kill them. Whenever I hear the word "stalker", it just sends me to all the Serial Killer biographies I have read.
But the way you're putting it, it's on the lowest level possible and can barely be called "stalking"- imo. I look at people's myspace comments all the time and read conversations that have been going on. I like to learn about people's relationships and issues, even if they are oblivious to it. I honestly believe that most of this "Myspace Generation" can be considered this form of a stalker though.
I say stalker lightly because there are many extremes to the word. When you think about a stalker you mostly think about those aggressive types that murder people because of the obsessions but the words is also used to describe someone who is harmless in nature and only want to observe others lives.
There is a legal definition of the term stalker that applies more towards those that are law-breaking individuals but the word has a very diverse meaning now. I wasn't expecting everyone to jump to conclusion that I was talking about the vicious type.
It's not hard to believe that most people do the same; even though when you're confronted by other you may be called a stalker and a creep.