This is about instant personalisation, where you don't have to log in for any of this stuff to happen.
It should be a huge reason to log out of Facebook after every visit (or not use it at all), but 99% of users are never going to do that.
It should be a huge reason to log out of Facebook after every visit (or not use it at all), but 99% of users are never going to do that.
I had forgotten that I had turned off instant personalization (likely due to some TC article or something). So this works without even logging into the site? Jesus, it is worse than I thought!
Aside from the benefit of not staying logged in to your email/FB/Twitter when browsing random websites[2], this also lets you treat constantly open web-sites as legitimate apps in your switcher, frees up those permanent tabs on your browser, and provides for features like an unread count badge on the application icon when you switch apps.
[2] Obviously, this means that features that rely on you being constantly logged in to FB/Twitter (those Like and Tweet buttons) won't work.