A “shadow profile” refers to the data Facebook collects about individuals without their explicit permission. For example, the “like” button that appears on third-party websites allows the company to collect information about an individual’s internet browsing habits, even if the individual is not a Facebook user.
Unless it collected data without even having a Facebook account, it’s still an empty house.
I was a MySpace and LiveJournal user until about 2003. At which point I moved to Digg, and then was on Reddit from 2007 until I came to Lemmy.
All my friends thought Facebook was lame. Mark didn’t even auto add you as a friend like Tom. 😔
I don’t know when they started but yes they do that.