Well, it doesn't have to be stalker-like ...
I for one, would like such functionality so I can tell people that I am going to reboot my computer before I turn off iTunes, as an example.
It would be a great way to find music.
(Ex: Hey, you listen to <random song>? You should also listen to <another random song>...)
It'd be a great way to meet people, and have a basis for talking to them.
(Ex: Hey, you like the music I like! ...)
Of course, without a disable or ignore certain IP/MAC address button, it might turn stalker-like...