This is a bad attempt to ridicule the issue. Obviously we're talking about data here that is processable by third parties. Nobody but you can get (reliable) data out of your brain, but pictures of you or information about you kept on recording can be used by third parties for everything ranging from policing to advertisement or anything else.
In Germany for example Google Streetview is mostly not available, because a significant percentage of people considered it unacceptable and have the right to opt out of it, and the company has to blur faces, houses, addresses and so on.
It's not processable by third parties? If you tweet that you met me at a conference and then someone else tweets that you saw me at the airport, etc. now people can't use that to infer my location and travel patterns? You're just drawing the line conveniently where you can violate my privacy while simultaneously claiming the higher ground.
I hope your friends treat you with the fear that they should considering you seem to believe that their private information is not "processable by third parties" and therefore probably treat it with no discretion whatsoever.
