everything you do on google is tracked and compiled so that they can build a comprehensive profile their users. The aim, as stated by google top boy (i forget his name), is that in few years time you'll be able to ask google what religion best suits you, and it will give you a personalised answer based on your internet browsing history. He claims their centralised information processing network is reaching near-sentinent ability. Read any recent google statement on the matter, they're being open about it. Google are on a total information takeover right now, and I really don't know if that's a good thing. So google.com/ig is no longer my homepage.