Not all stories have happy endings. Brett Gaylor, a documentary filmmaker who calls himself an activist for a free and open Internet, developed the web series “Do Not Track” as a cautionary tale about the web as a menacing, all-seeing eye.

“Over the past couple of years, aspects of the Internet began to bug me,” he said. “I became less of a web evangelist and am now more critical of the amount of personal information being mined.”