https://www.cnet.com/news/new-safari-privacy-features-on-macos-mojave-and-ios-12-crack-down-on-nosy-websites/

When Apple announced a new Safari privacy feature last year called intelligent tracking protection, advertisers accustomed to tracking your behavior online squealed. After Apple's news at its developer conference Monday, you can expect some more squealing.

At Apple's Worldwide Developer Conference, the company showed some new restrictions it's imposing on online tracking technology. For one thing, when you use websites with buttons to like and share stories, Safari will intervene to prevent those tools from slurping in your behavioral data unless you permit it.