Sam Schechner and Keach Hagey report in The Wall Street Journal:

Google plans to stop selling ads based on individuals’ browsing across multiple websites, a change that could hasten upheaval in the digital advertising industry.

I don’t even know what to make of this, unless it is a flex of Google’s monopoly power in search, maps, and video (YouTube). Who needs to track users across websites when every browser tab starts at or ends at a Google-owned website?