I'm fine with nudity (worked at a nudist camp one summer), and have filmed and videotaped nude people running around outside for art projects. I've heard that in Finland for example it might not be unusual to share a sauna in the buff with your bank manager or grocer. I kind of wonder if cultures (like the US) that have more issues with nudity also tend to sexualize it more overall. That said, when I taught high school it would have been pretty personally embarrassing if nude pics of me became available to my students for example -- because culture is what it is.
I also think until recently maybe folks thought that cloud storage WAS fairly private, or maybe didn't even realize it was happening with certain devices. There are security measures, and you don't think about people riffling through your itunes collection for example.
Hacking exists, but so does crime in all it's forms, and personally I've had a lot more stolen from someone running my credit card physically over one of those imprint machines or breaking into an apartment or wallet. While I take basic precautions, I'm not going to clear my browsing history daily for example or hide my ISP.
Like Janet, I'm already partly in the public online sphere (both in RL and in other online communities under usernames), and get feedback from strangers (not always positive) on a weekly basis. Actually my entire career is the result of social media/online blogs so for me the positives of giving up a certain amount of privacy outweigh the negatives.