Google+ platform websites integration using the Google+ platform tag.
Let visitors recommend your content on Google Search and share it on Google+.
This site uses the viewport meta tag which means the content may be optimized for mobile content.
Open graph description entity tag
The average rating based on multiple ratings or reviews.
A scheme.org entity that represents an organization such as a school, NGO, corporation, club, etc.
Sites who has this tag are verfied by google to use WebMaster tools