The Google +1 is the equivalent of Facebook's like, it's aim is to rank sites in order of viewer likes as opposed to SEO and backlinks, hopefully it will encourage people to create people friendly sites as opposed to finding a way to thwart the search engines
this button is like giving like to your page , so that it is like that page is recommended by people using google , so it may help in traffic ,its just like facebook ,where we like other's page.
Adds the Google +1 button to your website's posts, pages, attachments, and custom post types. Has a variety of options for button style and position, and exposes a wp_plus_one_button action for custom integration with the theme or other plugin. Adds the Google +1 button to posts, pages, attachments, and custom post types (enable/disable for each) Allows you to disable the +1 button on specific pages in that post/page's metabox Four display styles (standard, small, medium, tall) Enable / disable the +1 count on the buttons 4 position options for top and bottom of the post (independent) - (float left, float right, no float, or none) NEW - +1 button widgets NEW - redirect the user to a custom URL after clicking the +1 button Custom CSS to add custom CSS styling to the button code Exposes a wp_plus_one_button action for custom integration with your theme or plugin Exposes the +1 button clicks as pubsub events: subscribe with plusone.subscribe('click', function(params) { ... }); in your custom JavaScript