Google recommends webmasters follow the industry best practice of using responsive web design, namely serving the same HTML for all devices and using only CSS media queries to decide the rendering on each device.
Omitted (negligible): drupal site builder, squarespace site builder, strikingly site builder
Surprising? Facebook strongest but decreasing 20-25%. Social Media slightly increasing (again) since 2013. Twitter marketing relatively contstant over the past two year. Content markering on the rise since five years.
"It's marketing, stupid" (according to Bill Clinton)