I have never signed up for Facebook but if my family members have ever "uploaded their phone contacts to find more Facebook Friends" or if my relatives have ever uploaded pictures with me in the picture ((Facebook has detected a face we don't recognize. Please tag the person in this picture)), or if I have a US Government Name and/or Social Security Number, there's a company that is building a DATABASE DOSSIER with information about me. I cannot ask them to please DELETE information they have about me because those Shadow Profiles are SECRET, I'm not even supposed to KNOW that these creepy data-scrapers have a file on me.
Facebook is just the front end for the NSA / surveillance state backend, and at this point it's frightening how Too Big to Fail they have become.
When you're designing a Big Brother dystopia in which everyone is tracked and surveilled, step one is to create something like Facebook. "All your friends are doing it! You should too!"