Facebook knows who you are, who your friends are, and just about everything you and your friends "like" -- to read, to buy, to look at -- on the Internet.
This scares the pants off Google.
To Valley and tech types, Facebook's collection of data is known as the "social graph."
The reason it worries Google is that increasingly, Facebook is using that data to show users things to read, buy, and do on the Internet before those users get the chance to Google search for those things.
The social graph turns the Internet into Facebook's platform, not Google's.
Again -- that worries Google silly. As it should.
So, what is Google doing about it?