Why is this webpage different from all other webpages?

Online culture makes me blink occasionally, because its givens are so different from RL common sense. Possibly the most blinkworthy for me are those occasional posts from lj-users demanding- not civilly inquiring, note- that the people who've friended them stand up and identify themselves. 'Who are you? What are you doing here? Many of you have never left me even one comment- and I've been checking, don't think I haven't!! Throw down your guns and come out with your hands up!!'

Possibly I misunderstand the ethos at work. A live journal is an online webpage viewable by anyone unless it's f-locked. Why the objection to people viewing it? Why the objection to people using the tool provided- lj friending- in order to view it more conveniently? Why the hint of paranoid hysteria? "OMG this person is stalking me by reading the webpage I have online." (Stalking = reads someone else's journal? Sheesh.) "I've checked her through lj toys and she's come to look at my lj *every single day.* eww shudder scary"
( Hard up for a frisson, aren't we? )