MachineMachine /stream

When historians of the future look back on the perils of the early digital age, Stacy Snyder may well be an icon. The problem she faced is only one example of a challenge that, in big and small ways, is confronting millions of people around the globe: how best to live our lives in a world where the Internet records everything and forgets nothing — where every online photo, status update, Twitter post and blog entry by and about us can be stored forever. With Web sites like LOL Facebook Moments, which collects and shares embarrassing personal revelations from Facebook users, ill-advised photos and online chatter are coming back to haunt people months or years after the fact. Examples are proliferating daily: there was the 16-year-old British girl who was fired from her office job for complaining on Facebook, “I’m so totally bored!!”; there was the 66-year-old Canadian psychotherapist who tried to enter the United States but was turned away at the border — and barred permanently from vi