[zerostar07]

What is facebook's business? Targeted advertising. They don't sell you a friends management system for $0, they sell targeted ads to people who expect to receive targeted ads, and tracking is necessary for that.

The same can be said about google's search service. The search still works, but adsense and adwords won't work without your private info. And google can claim it doesn't sell search, they sell ads.

[KozmoNau7]

It's not strictly about which services you are selling, it is about which services you are providing, and Facebook absolutely provide a social network website/app. Google absolutely provides search and email.