User blog comment:Doctor261/Google Steals Our Privacy/@comment-1295538-20120731165417

You give that much info and more on facebook for the world to see too.

Look all they want with your data is to make money from it, be it using your info to tailor advertising to your tastes so they're more likely to make commission on adverts as if adverts are more things that you like then your more likely to click thru and buy stuff. They also sell on your details to advertisers so they know who to target with their marketing campaigns too. Basically its mostly just to make money off of you. And then some of that stuff is required legally so they know who you are so they know who to go after & arrest in case you've been doing illegal things such as distributing child porn, copyright infringement, fraud, harassment or hacking people's accounts on stuff (e.g. identity theft or steeling your intangible digital property on Second Life).