Google: Mobile-first Indexing Friday, November 04, 2016

Robru

Well-known member
Today, most people are searching on Google using a mobile device. However, our ranking systems still typically look at the desktop version of a page’s content to evaluate its relevance to the user. This can cause issues when the mobile page has less content than the desktop page because our algorithms are not evaluating the actual page that is seen by a mobile searcher.

To make our results more useful, we’ve begun experiments to make our index mobile-first. Although our search index will continue to be a single index of websites and apps, our algorithms will eventually primarily use the mobile version of a site’s content to rank pages from that site, to understand structured data, and to show snippets from those pages in our results. Of course, while our index will be built from mobile documents, we're going to continue to build a great search experience for all users, whether they come from mobile or desktop devices.

https://webmasters.googleblog.com/2016/11/mobile-first-indexing.html
 

Divvens

Well-known member
If you have a responsive site or a dynamic serving site where the primary content and markup is equivalent across mobile and desktop, you shouldn’t have to change anything.
Doesn't effect us XenForo owners in any major way, thanks to responsive design compared to a completely separate mobile site/app.
 

Mouth

Well-known member
Top