This is horrifying:
By buying or licensing data or scraping public records, third-party data companies can assemble thousands of attributes each for billions of people. For decades, companies could buy up lists of magazines subscribers to build targeted advertising audiences. These days, if you use a smartphone or a credit card, it’s not difficult for a company to determine if you’ve just gone through a break-up, if you’re pregnant or trying to lose weight, whether you’re an extrovert, what medicine you take, where you’ve been, and even how you swipe and tapon your smartphone.
The data brokers quietly buying and selling your personal information
Source: Fast Company