What Are Google Preferred Sources? (And How to Add the Button)

Since 20 August you can put a button on your own pages that lets readers tell Google they want to see more of you. Google says they are twice as likely to click through.

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Google now lets readers pick which sites they want to see more of. It is called preferred sources, and since August 20 you can put the button for it on your own pages.
Check you can use it first. Open google.com/preferences/source and type in your domain.
Then it is a button on your blog pages. A reader clicks it, and from then on Google puts your posts in front of them more often, badged, in Top Stories and inside AI answers.
Google says people are twice as likely to click through to a preferred source.
Here is the entire install:
<script async src="https://news.google.com/swg/js/v1/publisher.js"></script>
<div google-add-preferred-source-btn></div>
This script goes in the head, div in your article template so every post gets it. The click adds your whole domain, not the page they were on, so one click covers everything you publish.
Google is clear that this does not directly affect your rankings in general. But it does indirectly.
Every reader who clicks keeps landing on your posts no matter what the rankings do that month, and those are the readers who link to you, quote you and pass your stuff around, which is the thing Google has always said moves rankings.
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P.S. If your CMS blocks scripts, there is a plain link version that works in social posts and emails too. Google's docs have both.