Bryson Meunier from Resolution Media posted an update on his personal blog about the correlation between mobile content and ranking in Google.
The study came out with three findings:
(1) Having mobile optimized and rendered content is still highly correlated with getting organic traffic from Google. The study showed that 89% of the sites in the study that rank, all have either mobile URLs, dynamic serving, responsive web design, or some hybrid. But 89% of the sites that rank well, have some form of mobile rendered web site available to mobile users.
(2) <Switchboard tags have not been widely adopted by webmasters in this study. In fact, according to this study, only 4% of enterprise sites use them.
(3) The number of dynamic serving and responsive design web sites have increased year-over-year compared to sites using mobile only URLs. However, still, the majority of the sites in this study use mobile URLs, 67% do. 11% use dynamic serving methods and only 4% use responsive design. Here is the break down: