Google Adds Documentation For Follow Button For Websites
https://developers.google.comThe Follow feature lets people follow a website and get the latest updates from that website in the Following tab within Discover in Chrome. Currently, the Follow button is an experimental feature that’s available to some users in English in the US that are using Chrome Android Beta.
By default, the Follow feature uses RSS or Atom feeds on your website. If you don’t have an RSS or Atom feed on your website, Google automatically generates a feed for your entire domain based on our view of your site. If you have one or more feeds on your website, you can optimize your Follow experience by explicitly telling Google which feed you want people to follow for a given page on your site.
To help Google understand which feed that you want people to follow for a given page, add the following element in the <head>
section of your hub and leaf pages, referencing your RSS or Atom feed:
<pre><code><link rel=”alternate” type=”application/rss+xml” href=”https://feeds.feedburner.com/blogspot/amDG”></code></pre>