Google Announced Yesterday two important changes to it's mobile ranking algorithm. The first piece being that the 'Mobile-friendly' label will be removed from search results on mobile devices. Their logic being that over 85% of sites returned in their results are now mobile-friendly, and removing this de-clutters the interface. Keep in mind, however, that this 'mobile-friendly' flag will still be used in determining your sites ranking in returned results. You can still measure your site's mobile performance in your Google Webmaster Tools.

 
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Example of the Mobile-Friendly Label
 

The second announcement, and arguably the more important of the two, is that Google will begin penalizing mobile sites that use intrusive interstitials on January 10th 2017. What is an 'interstitials' you ask? According to Wikipedia, an Interstital is:

"A page displayed before or after expected content on the page"

Google expands this to include pop-advertisements, a well as a number of other intrusive 'alerts' you most likely have encountered while browsing the web from your phone. You can find examples of acceptable and unacceptable interstitials on Google's blog post if you would like to know more. If your site uses any of the techniques outlined, you have until the end of the year to correct the problem, or face being potentially ranked lower in search results returning your site or it's sub-pages.