a very long time and which facebook does for them rea read >> at least with facebook and incii instagr instagrami can say i don't like what you're doing. >> national geographic pulled out of instagram and they changed the policy. so we have power with these businesses? >> we have power if we have knowledge but overall i think it's pretty frightening how much our privacy is invaded and that we don't know it. >> a couple of years ago facebook changed it's privacy settings. >> yeah, overnight facebook went from basically allowing users to have their settings, private settings to turning all of those switches basically on. saying now default is to share with the entire world. if you had gone in and had your settings put to private, they flipped them to public. so you had to go in and say i want to keep my information private. >> but that's only if you can figure it out. it's not so easy. >> people didn't know about it. at a tech conference mark zuckerberg was asked about the change. >> doing a privacy change for 350 million users is a -- it's not the type of things that a lot of companies would do.