You've heard us talk about targeted ads before and you've probably experienced them firsthand. This is when ads for an online store you shop at, or for a product you've looked at recently, seem to follow you around the internet.
Most of the time, this is thanks to ad networks. An ad network is made up of companies that share information they know about you so you see ads you're more likely to click on. While that's scary, it also means you can opt out in one place and it applies to many companies, as in the case of Facebook and the Digital Advertising Alliance. However, Google has another ad-targeting system you need to know about.
If you weren't aware, Google owns and operates one of the largest ad networks around. It's called DoubleClick, and it serves ads on a high percentage of internet sites, including ours.
Where things get tricky is that Google also owns and operates Google Search and YouTube. People use both to find websites and videos that interest them, which means Google can quickly compile a list of your interests from what you look for. Enter Google's interest-based advertising.