The Social Graph is Neither (Pinboard Blog): Imagine the U.S. Census as conducted by direct marketers - that's the social graph.
Social networks exist to sell you crap. The icky feeling you get when your friend starts to talk to you about Amway, or when you spot someone passing out business cards at a birthday party, is the entire driving force behind a site like Facebook.
We have a name for the kind of person who collects a detailed, permanent dossier on everyone they interact with, with the intent of using it to manipulate others for personal advantage - we call that person a sociopath. And both Google and Facebook have gone deep into stalker territory with their attempts to track our every action. Even if you have faith in their good intentions, you feel misgivings about stepping into the elaborate shrine they've built to document your entire online life.