My other half, though in her 20's, is also part of the "share it all" and "it'll never happen to me" generation, despite being as paranoid and insecure as heck about everything (though generally only paranoid about what her friends think, what I think etc, rather than things that actually matter). Drives me up the wall, especially given she should be mature enough to know better.
Kids are already being brought up to "share it all" and "it'll never happen to me", and have been since I was a child. However, with the introduction of the "internet to the world", and more and more reliance on technology for everything from education to the simple act of talking to friends, and a major lack of education and monitoring by the parents (who alas are even worse than the kids they're meant to be looking after, and raising to be responsible), things are only going to get worse - especially if companies such as Facebook and Google et al, have their way.
Anyway, enough of my rambling.