"Tollbooths, ATMs, doctors' offices, online chat: You leave critical personal data behind wherever you go. Let's follow one American as he scatters his digital DNA.
First, Meet Mark, a graphic designer in Chicago. Like most of us, Mark knows his boss can read his e-mail, insurers can access his medical data. but he's blind to the bigger truth: personal data is collected, and sometimes shared, at a fantastic rate." [Popular Science]