Google+ platform websites integration using the Google+ platform tag.
ShareThis is the largest market for sharing and influence across the web, reaching more than 400 million users across nearly 1 million sites. ShareThis makes content more engaging for publishers and marketing more impactful for brands by tapping into its true influence and value. Based in Palo Alto, CA with offices in New York a...
Sites who has this tag are verfied by google to use WebMaster tools
A canonical link element is an HTML element that helps webmasters prevent duplicate content issues by specifying the "canonical", or "preferred".