“Google, Amazon and Facebook know more about you “
Amazon I use. Google? No. I use Ixquick. No tracking, no cookies. No “social” networks either. And I hate having a cell phone! Required for work.
You don’t have to go to google or the social sites for them to have info on you. Google analytics is used tons of sites to collect and process lots of data on their visitors (watch your status bar and you can usually see it, they collect data on the way out and the site is slow, any website you visit that is slow to leave is almost always google analytics), and of course that’s all going through google so they get all that info on you.
The social sites use those “like” buttons, which sites that use them use “canned” (pre-done code for easy inclusion) part of that canned code is a ref to the icon and a couple of other things that go through their site, so if you see a FB like button (or a digg, or a +1) that means FB knows you visited that site even if they don’t have an account to link it too.