What is Google +1. If you find the search result useful or just enjoy the linked site, you hit the +1 icon. Google says by +1-ing a result you're giving it a recommendation, a stamp of approval. More +1's on a result means the site is more interesting. This plugin will help you to promote your site in the Google search and make it more popular. This button helps your users tell what they like.
Google +1 allows you to mark the article “liked”. The button also provides a current count of how many times your story has been liked on Google Search Engine.
Add the Google +1 button to your website's posts, pages, attachments, custom post types and help your visitors recommend it on Google Search and Google+ . It has a variety of options for button style and position.