Agreed. But at least I don't leak their data in return. I figure Facebook must have 99%+ coverage of the world's social graph by now, including all the holdouts. You may not have an account, but they know you exist, what you look like, what your phone number is and probably where you are just by observing the nodes that are still 'blank'. Shadow profiles should be assumed to be just as detailed as the rest. It's one reason why there are very few photographs of me online (or elsewhere). I'd like the option to go rogue one day to be open to me ;)