In general? Or is it certain segments? A demographic? Social networks only?
http://elitedaily.com/life/facebook-looking-vs-facebook-stalking/602509/
This is only a great example, not the only place I've seen this sentiment. It seems popular.
When I was growing up on the web, it was a place of places to be linked and discovered. If you put something up on a vanity page it was solely because you wanted as many people as possible to see it. People had counters to show off how many visitors they'd had. They took pride in (naturally) exceeding their bandwidth limits.
Now people put things online and expect you not to look at all of it. On the old web, scouring a newly found personal site, often including autobiographies, was completely the norm. Now it's stalking.
There are places that are open but you're expected to simply not go to them, as if in analogy to the real world, where there are places you're physically able to go, and words you may overhear, but you're expected not to go there or to acknowledge what found your ears, so as to keep the peace. These things are unavoidable in person. On the internet, everything is deliberate. Or should be.
Do you see the change too? Or am I just freaking out?