Alan my friend, for example, was caught in the background of this photo when a selfie was taken, he was not tagged in this photo. but instead a facial recognition was taken and his facial details were stored in a data file under unknown face #######, then it was discussed that someone called Alan who isn't in any of the people talking friendslists or their friend's friendslist about how "he" was on "his" "phone" all "night" at "Wetherspoons" what facebooks algorithm does is store this bit of data with what's known as a shadow profile with data such as Alan is a Male who has a phone and was in this location at this time of night. now that's from two people talking, think how many people and cameras you walk by daily, all this data is getting stored in this shadow profiles, as what I would call second-hand intelligence, information that could be damaging without context. although there are no reports of these shadow profiles that are talked about being used to track or be used against someone, but why leave that to possibility. I would rather be able to give context and in a sense be able to write my own intelligence profile with the proper intelligence that's not out of context.
to explain this being out of context what is mean is like this for example:
Jenny "Ben is crazy about his guns"
Jessica "Yea Ben has tons of guns at his place"
Jenny "Yea he was carrying his guns to the car this morning"
ok in many systems this would be marked with flags with no context such as the keywords of Name, Crazy, Firearms, and Travel that information could be used in a way against Ben, now if Ben had a profile on the platform and had it clearly stated that Ben is an Olympic Shooter that would give context to the use of firearms. probably a bad description there but it's an example I can think of right now.
But for me, I would much rather have a profile on Facebook with what I want them to know, and not just out of Context conversations for a person without a profile called CyberViking in a random conversation.