On April 21, google has expanded their use of mobile-friendliness as a ranking signal. This change will affect mobile searches in all languages worldwide and will have a significant impact in our search results. Consequently, users will find it easier to get relevant, high quality search results that are optimized for their devices.
2. More relevant app content in search results
On February 26,Google has begun to use information from indexed apps as a factor in ranking for signed-in users who have the app installed. As a result, they may now surface content from indexed apps more prominently in search.
If you have a site, you can use your Webmaster Tools account to get a full list of mobile usability issues across your site using the Mobile Usability Report.