Something we all have... but don't know about o_O

As part of Mrs. L's blog challenge, I am writing about my Digital Dossier.
According to the video, your digital dossier (okay I'm calling it DD from now on) is basically a build up of all the digital tracks you've left behind that people know about. It doesn't just start when you join facebook, but even text messages sent (I actually don't think they existed when I was born- wow i feel old) when babies are born are all part of that baby's DD :O
So basically, Google knows everything about us? Scary shtuff! I guess we really do have to be careful about the things we post on the internet...