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Search for wp-plus-one in Plugins > Add New.

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
• Spanish translation kindly provided by InMotion Hosting

From Google:

The +1 button is shorthand for "this is pretty cool" or "you should check this out."

Click +1 to publicly give something your stamp of approval. Your +1's can help friends, contacts, and others on the web find the best stuff when they search.

+1's are expected to influence a website's search performance, so be sure you are integrated now.

Find out more about the +1 button

As easy as enabling a plugin!

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