Happy Birthday Google

I was watching the news today regarding how successful Google in this 10 years. I still remember the old Google back in 1998.
Anyway, long story short, Google knows that what you searching on the Internet such as your medical history, illegal downloads, and much more.
My question is, is it OK Google to do it? Well, the Google says that it use the data to get how people click and search.
Finally, do you want to know how big Google is?

It's a combination of McDonald, Boeing and FedEx.