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FB Share is a WordPress Plugin, which lets you add a Facebook Share button for your WordPress posts, together with the total number of share.

Usage

There are three ways you can add the facebook share button. Automatic way, manual way and using shortcodes

Automatic way

Install the Plugin and choose the type and position of the button from the Plugin’s settings page. You can also specifically enable/disable the button for each post or page from the write post/page screen.

Manual way

If you want more control over the way the button should be positioned, then you can manually call the button using the following code.

if (function_exists('fbshare_button')) echo fbshare_button();

Using shortcodes

You can also place the shortcode [fbshare] anywhere in your post. This shortcode will be replaced by the button when the post is rendered.

More information available at the Plugins home page.