https://www.linkedin.com/settings/wvmp-visibility?goback=%2E...
Personally I keep mine fully on since it is a good way of passive contact (I once browsed ~1000 VCs with a headline that was somewhat provocative as an experiment and about half looked at my profile back and 6 of them emailed me asking what I was working on).
Note: I actually designed this feature at LinkedIn after doing a ton of interviews with people and going to multiple privacy organizations and the EU to make sure it wasn't violating anyone's privacy by making it a tit-for-tat system that was by default anonymized (if you click on profile stats, it prompts you to switch your setting if you want to see who has viewed your profile (or did when I was there)).
Links to people's private profiles have an auth token in it that is good only for the account that generated it, so unless you're relatively closely connected, you can't actually view links to random private profiles posted by people on the internet.
In fact, there is an bookmarklet that shows the list: http://thekeesh.com/2013/03/updated-facebook-friends-ranking...
http://help.linkedin.com/app/answers/detail/a_id/42
>You'll see profile stats about who's viewed your profile if:
>You have a premium account. This will also give you access to Profile Stats Pro.
>You have a free basic account and have set your privacy settings to show your name and headline.
In other words, as long as you shell out some cash you can avoid detection while viewing other people's profiles but still see when they view yours.
-It tells people when I view their profile. So now I never view people's profiles because I don't want to look like a stalker. Imagine if Facebook worked this way.
-An andecdote, but maybe you've experienced it: a guy I worked with about 3 years ago (and only for 2 weeks) has "endorsed" me several times recently. I don't know if this is some kind of quid pro quo, but it makes me somewhat uncomfortable.