To complement your point and quoting from the link: > The information isn't viewed by humans (not in an identifiable way) That is until someone wants to active

To complement your point and quoting from the link: > The information isn't viewed by humans (not in an identifiable way) That is until someone wants to actively query it, then it can be made human-friendly, and like you said, we don't really know just what details they are storing and how they are profiling us. It doesn't ever escape my mind that whichever country I live could just well suddenly suffer from a state coup (or in some cases are already under dictatorships) and right then I could become a political target for the sum of all my recent activity. Right now I'm living in a democratic state and have my civil rights, and so I act accordingly. But that's all stored somewhere and if things change, the state can simply gunpoint a service and have them disclose all my personnal data. Said service doesn't even need to have a secret agenda for my info, but they are its holders so they might be targeted. That also brings a different point which is the security in which my information is being held. Can a big service like Facebook's or Google's be hacked? It most surely can. And then, just how much data will be compromised before it's in the wrong hands. Cyberwarfare is here.