Google+ is becoming increasingly important. Although the wider Google+ service hasn't started to significantly affect Google's search results just yet, it's just a matter of time before they do so. It can be seen as wise to set up and manage a Google+ for Business page and share your content on there. This will help you build up a collection of followers which should, then help raise your socially-impacted search results.
Furthermore, if you would like to take advantage of what's called "Rich Snippets" - which are additional content displayed next to your website in Google's search results - it is essential that you follow some steps to relate your mobile site (and your desktop website) to the Google+ service. To do this you can add a link to your content editor's social profile on Google+ with a special link and link back to the mobile site from within Google+. You can find out how to do this here.