(MotherJones) – Last week the Wall Street Journal ran a terrific series of stories called “What They Know.” The general subject was personal privacy—or the lack of it—in the digital world, and the first article in the series explained how websites routinely track your movements on the web and collect a genuinely astonishing amount of personal information about you in the process. The Journal examined 50 sites using a test computer and discovered that these sites collectively installed a total of 3,180 tracking files—an average of 63 tracking files per site:
The state of the art is growing increasingly intrusive, the Journal found. Some tracking files can record a person’s keystrokes online and then transmit the text to a data-gathering company that analyzes it for content, tone and clues to a person’s social connections. Other tracking files can re-spawn trackers that a person may have deleted.
….Some of the tracking files identified by the Journal were so detailed that they verged on being anonymous in name only. They enabled data-gathering companies to build personal profiles that could include age, gender, race, zip code, income, marital status and health concerns, along with recent purchases and favorite TV shows and movies.
A full list of the sites they examined is here. The most intrusive were dictionary.com and msn.com, which installed over 200 tracking files each. The least intrusive were craigslist.org and wikipedia.org. Continue reading