It's not necessarily a conspiracy. Facebooks early company board had strong government connections.
Most worked for the CIA or CIA consulting companies in the past. They understood the rather obvious utility Facebook is as a intelligence gathering tool. East German Stasi never achieved that level of penetration that Facebook has and sadly whatever you put up it's forever even when you leave it or delete it the facial recognition programs etc are still busy working out who you are where you been or not and with whom
if you wanted to totally ruin and make facebook data worthless as it is to start filling those pages full of rubbish data and pictures and that way Facebook loses its inherent value to its backers CIA, NSA and any other 3 digit or more agency so on out there,
for more on INTELLIGENCE Gathering