This is the author of Ghostery. Sorry if it came off that way that is not my intent. I am not pitching my "free" product.

The difference here is that Media6 Degrees collects your behavioral data ties it with your social graph (your friends) data packages it up and resells it to other ad networks to target you.

Google Analytics data doesn't get sold to 3rd parties nor is it used by AdWords/AdSense to target ads at you (at least that is Google's claim).

Sorry if this came off as an ad, its not.