MHJGetty Images Apple has unveiled a new data privacy tool called App Tracking Transparency, which lets you block advertisers from tracking you between apps. It's one of several methods you can use to stop third-party advertisers from following you around the internet. Try turning off personalized ads on Chrome and Facebook, enabling "Do Not Track" in your browser, and turning off cookies to further protect yourself. Today is Data Privacy Day, which is an international event to raise awareness and promote transparency around, well, data privacy. That means it's the perfect time to finally hunker down and figure out how to get those creepy ads to stop following you around all over the internet.