As the celebrity photo-hacking scandal has made clear, privacy isn’t what it used to be.

Whether famous or seemingly anonymous, people from all walks of life put all sorts of things online or into cloud-based storage systems, from vital financial information to the occasional nude photo. Periodic cases of hacking fuel outrage, but there’s no retreat from digital engagement or any imminent promise of guaranteed privacy.

“We have this abstract belief that privacy is important, but the way we behave online often runs counter to that,” said Nicholas Carr, whose extensive writings about the Internet include the 2010 book, “The Shallows: What the Internet is Doing to Our Brains.”

“I’d hope people would understand that anything you do online could be made public,” Carr said. “Yet there’s this illusion of security that tempers any nervousness … It’s hard to judge risks when presented with the opportunity to do something fun.”