Maybe it’s slight: a Hotmail account here, a comment on a news story there. Or maybe you’ve been more prolific, leaving a trail of usernames, accounts, messages, and profiles across the digital landscape. In any case, an active internet user owes it to himself to do a bit of self-Googling. What you’ll find will be both enlightening and humbling—even worrying. Unease about your online identity shouldn’t be limited to how much information is publicly available.