The WordPress Social Ring plugin allows you to include sharing buttons to social networks on posts and blog pages. By using this plugin you can highly increase visibility on Twitter, Facebook and Google +. Furthermore, it has been recently confirmed by Google that the +1 button will be taken into account for Google ranking and this will imply SEO relevance.
The available buttons are Tweet which allows you to share articles on Twitter ( title + URL),Google Plus One, Facebook Like, Facebook Share, Facebook Send, Pin it, LinkedIn and StumbleUpon.
Facebook needs OpenGraph meta tags to take the correct image, title and description. You can use other plugins such as WordPress SEO to generate OpenGraph meta tags.
In the plugin administration panel you can activate/deactive different buttons, for example you can choose in which pages they will be shown, decide if they will appear first or after the post/page content. Please note if you choose to show buttons on the home page, archives or categories, they will work properly only if the posts in these pages are entirely readable and not only excerpt.
From version 1.2.0, you can also choose button counter style (vertical or horizontal) and button language.
The plugin is ready to be localized and it includes the Italian translation. It can be downloaded from the official page on WordPress.org.