Yes, I do in fact stalk, although whether it abides by the legal definition of stalking is yet to be seen or determined. My own twisted Aspeger's perspective classifies what i do as information gathering, logical deduction, and common sense, although society (note: my classmates) note it as stalking, creepy, weird, and perverse.
Initial "stalking" occurred in freshmen year, when I began deducing ID numbers from grade sheets. In one instance, a girl kind of taunted me, boasting that she had gotten 20/20 on this one assignment. Nobody took that one assignment seriously, so most of us got low grades on it (I got an 11/20). I go to the grade sheet, look at the column for that assignment grades. There are only two in her period. Her last name is near the middle, so I go back to her and ask, "Is your ID number 300975?" "Stalker!" she cried. And so forth; I memorize the arrangement of last names, the ID number range (318 tends to be A, while 321 tends to be Z), and the likely grade, and figure it out from there.
Stalking has deliberately been enhanced by my precipitous need for social contact, any kind of social contact. I dangerously attempt to fill that need by replaying and letting myself more intimately absorb the interactions, such as when they exclaim "Ohmygosh!" or ask my why I do such things. It's quite possibly the most vicious cycle I have sucked myself in.
ID numbers are yesteryear, unfortunately. Now it's been upgraded to my Canon PowerShot A400. I took 345 pictures in the first two days alone at Yosemite. When I unloaded the pictures, I selected a few of the best and submitted them to SnapFish to print. The response I got from them was lukewarm. Frazzled by the lack of generated controversy, I shrank back into the shadows and waited.
Then we we went on a whale-watching trip. I took 178 pictures of that event, 108 of them being pictures of my classmates. Nearly all of them are candid and secret shots, since I don't believe any other kind of shot is really legitimate; they're fake and posed and unreal. This time, I picked 20 pictures to distribute and generated a good response. Nobody can deny that the pictures are good - one notable one is of a dating couple in an absolutely romantic pose (both are smiling, looking towards the right of the picture frame), or of card games - but nobody denies that it is just a little creepy.
As someone who spends 100% of his time at home, yes I do crave the school environment, and sometimes and purposefully walk alongside people. This doesn't create the controversy; it's the ID numbers and the camera that do all the work for me.