When I first joined the game, there were some people stalking me every now and then. Mostly because I created all of my characters beautiful and attractive and the other noobies wanted me for a mate. xD
But no, not a real stalking. At least not one that I remember.
I, on the other hand, can call myself a stalker. I pretty often sit and F3 the people around (well, okay, who doesn't it). I've followed people for a long time, yes. Once I clicked on a player so that starry thing could appear and I stalked them all the way, I eventually wanted to role-play with them, but then something happened and I gave up.