The simple version (the longer version takes more time than I have to write today).... If 3rd party cookies are blocked, then it's hard for Google to know what

The simple version (the longer version takes more time than I have to write today).... If 3rd party cookies are blocked, then it's hard for Google to know what people are looking at, and also hard to sell ads at the highest rates. However, if you connect an RSS feed into a user's google account via a browser button, then you now have access to all the things a user likes (by virtue of the fact that the user has clicked the follow me button, thereby signaling, "hey, I'm interested in this!"). I have no idea how this gets implemented for Google, but if there isn't some tie in to their advertising revenue, I'd be surprised.