I would choose to stalk but not being that dumb to admit yourself stalking people, unless your skills are really that bad that its just being too obvious.
But then stalking facebook (I mean by viewing their profiles and pictures) is certainly okay but not commenting on every single status update you posted and the comments that they made is like trying to 'lan suk' (term learned during A-Level days) to you but end up in an epic failure.
Or stalking your facebook updates and judge the way you communicate with others? I would tell these people, mind your own business. There are plenty lotsa things you can do other that judging people.
By stalking and giving constructive comments seriously will not get the person's attention (get it guys and girls?) unless they are truly despo that they rely on other people's point of view to decide how they should present themselves.