Visual Capitalist:

In the past, marketers would make judgement calls on your likely income and family structure based on where you lived, and you’d receive “targeted” mail and calls from telemarketers. Loyalty programs and the emergence of web analytics pushed things a little further.

Today, the steady march of technological advancement has created a vast data collection empire that measures every aspect of your digital life and, increasingly, your offline life as well. Facebook alone uses nearly one hundred data points to target ads to you – everything from your marital status to whether you’ve been on vacation lately or not. Telecoms have access to extremely detailed information on your location. Apple has biometric data.

Also watching your every move are web trackers. “Cookie-syncing” is one of the sneaky ways advertisers can follow you around the internet. Basically, cookie-syncing allows third parties to share browsing information at such a large scale that even the NSA “piggybacks” off them for surveillance purposes.

And:

While web trackers and companies like Apple and Google are collecting a lot of personal and behavioral data, it’s the whales of the data ecosystem – data brokers – who are creating increasingly detailed profiles on almost everyone.

According to a recent Motley Fool review, the goal of data brokers, such as Experian or Acxiom, is to siphon up as much personal data as possible and apply it to profiles. This data comes from a wide variety of sources. Your purchases, financial history, internet activity, and even psychographic attributes are mixed with information from public records to create a robust dossier. Digital profiles are then sorted into one of thousands of categories to help optimize advertising efforts.

Spend a few minutes browsing through the chart at the top of the article to get a sense of the overall data flow at work here. Shadow profiles. Chilling stuff.