The Hello Bar is a customizable, relatively unobtrusive bar that sits at the top of a website and directs visitors with a call to action. For example, the bar on Gary Vaynerchuk’s website prompts visitors to “Circle me up on Google+!”, while the one at Eric Ries’ Startup Lessons Learned points to the video of his Lean Startup tr...
Google+ platform websites integration using the Google+ platform tag.
Let visitors recommend your content on Google Search and share it on Google+.
Open graph description entity tag
Sites who has this tag are verfied by google to use WebMaster tools