Share Buttons by AddThis

It also allows users to recommend your website to their friends via email.

It's the WordPress version of the famous AddThis service.

Installation:

Unpack and upload it to the /wp-content/plugins/ directory.
Activate the plugin through the 'Plugins' menu in WordPress.

What is new in this release:

• Drag and drop customization of buttons.
• Better preview of buttons.

What is new in version 3.1:

• Better support for excerpts.
• Internal issues with tw:screenname resolved.
• Better JSON validation.

What is new in version 3.0.1:

• Bug fix:
• Issues with usernames/passwords with special characters.

What is new in version 3.0:

• UX changes in admin settings
• Credential verification in Admin settings. If AddThis account details are wrong it will be notified to user.

What is new in version 2.4.0:

• Refactored how we add code to pages which should eliminate how many times it is added.

What is new in version 2.3.2:

• Added opt out for copy text tracking.

What is new in version 2.3.1:

• Don't strip pintrest tags from custom buttons.

What is new in version 2.3.1:

• Don't strip pintrest tags from custom buttons.

What is new in version 2.3.0:

• Added Google Analytics option.
• Updated settings interface.

Requirements:

• WordPress 3 or higher