I'm backing >>47 up.
Following girls around is one of the worst things you can possibly do. I've been following a girl for a few weeks now and I completely ruined her life. Her reputation is torn to shreds and I feel like such a jerk having done that to her.
The only problem is I realized how much of a jerk I was too late. I got an IM from her ex-boyfriend telling me to forget she even exists or else his gang is going to kick my ass.
I've never been so paranoid in my life.