Adactio on the new paradigm of public/private

Ever though-provoking Jeremy Keith writes in Lock up your data of the clash of paradigms between those who assume that all their data will be public unless they specifically say otherwise vs those he expect the default to be privacy (old skool, like Jeremy and me, I guess). He suggests that this is not a technological question but a cultural one, to be addressed by a conversation between those offering APIs/access to data, developers using those APIs, people creating the data, and indeed search engines that crawl API driven sites. I haven't much to add except that I find the point about the cultural implications being key to be especially interesting.