In privacy circles, we all try to make sure that people are sensitive about what they post online. I remember a chat I had with a journalist at SFGate.com back in 2007 :
I generally advise people not to post things publicly without thinking about whether they're likely to regret having posted it. I also advise people not to post anything about other people (like pictures or videos), unless those people agreed to have it posted. But that doesn't mean that I think people should stop posting stuff about themselves and their friends online. In fact, I'm wildly enthusiastic about these social platforms that empower people to publish things about themselves and their friends to the world. The interesting risk-debate is about stuff in a gray zone, where one person's self-expression is another person's exhibitionism. This sort of gets summed up as a question that helps kids understand the consequences of posting things online: "even if you think this photo/video etc is cool, what will a future employer think about it when you start looking for a job?"
Digital natives are creating a part of their identity online. What they publish, or don't publish, is a self-created, highly edited version of their "identity" that they'd like to project. Digital natives are used to seeing lots of stuff about themselves and their friends online. The older generation isn't. So, rather than a technology clash, this strikes me more as a classic generational clash. The older generation warns the younger generation about putting too much of themselves out there, because, well, they never did, didn't have the opportunity, and no one in their generation did either. Perhaps that's why some people are calling the younger crowd Generation Xhibitionists.
Curiously, every time I've done an image search on my own name (and hey, regular "vanity" searches on your own name are an essential part of privacy hygiene, to know what's out there about yourself), I see a highly-ranked image search result of a guy in a bathing suit...who isn't me. Since I'm a believer in the principle that the best answer to bad speech (or bad content) is to confront it with better content, I figure I might as well post a picture of myself in a bathing suit too. The other guy is younger and better-looking, but hey, at least this is me. And to all those people who say I'm never willing to share anything personal online, well, call me Gen X.