Google is totally changing how ads track people around the Internet. Here’s what you need to know. – The Washington Post

It’s a common sight: Ads from that time you Googled flights to Cancún, or visited Nike to look for new running shoes, following you around the Internet.

Much of that tracking is made possible by cookies — little bits of code that jump off websites and lodge themselves in your browser, allowing new sites you visit to see where you’ve been before. Facebook and Google, the two most profitable advertising companies in history, use cookies to show ads across the Web based on info gathered…