OK looking at this thread, back from where it lost its track, I would correct myself and change the word scare with "doesn't it make you think" ?

Don't you think twice what google can do with all this information at hand ?
I had these thoughts long before someone send me this movie, so please stop referring to the movie, I am not trying to defend the guy who made it and neither I want you to buy on the "google is evil" theory.

Ironically was also correct for you information.
http://www.bartleby.com/62/95/I0859550.html

Why? What could they do with all this information?

This conversation for me is/was philoshopical as I told you, but you want hard facts of what can be done, so any hypothetical story I give you might sound like a story taken from the movies so I will not do that ...

Have a nice day

I thought the video was interesting. I don't really think Google has all the intentions it claims, but it's interesting to think what they could do. The video is a little high on the paranoia, but it's worth a look.