A simple and unobtrusive way to suggest more relevant content to users
Website operators with mobile versions of their site can now simply and quickly include code that suggests additional content based on information from Google+. The suggestions will rise up as a small bar from the bottom of the site, and only when the user scrolls up -- similarly to the way interface elements hide and show in some of Google's Android apps. The small bar shows a Google+ logo and a recommendation, which will be based on Google+ activity such as +1's and shares, as well as content from the current page you're viewing. Tapping the bar will expand the recommendation to the full page, with a scrolling list of cards of different page recommendations. For example when browsing Android Central, a recommendation page will show other articles +1'd by people in your circles. You can then +1 those posts directly and tap them to read in a new tab.
More: Google Developers