brasofilo

The OG image will be downloaded to your site and set as Featured Image of the newly created post.
From <a href="http://ogp.me/" rel="nofollow ugc">ogp.me</a>:
<blockquote>
The Open Graph protocol enables any web page to become a rich object in a social graph. For instance, this is used on Facebook to allow any web page to have the same functionality as any other object on Facebook.
</blockquote>
Translations: Português – Español. 
Released under GPL, you can use it free of charge on your personal or commercial blog.
<h3>Acknowledgments</h3>
<ul>
<li>Everything changed after <a href="http://wordpress.stackexchange.com/users/12615/brasofilo" rel="nofollow ugc">WordPress Stack Exchange</a></li>
</ul>

Post from Open Graph

Enter a URL and if the page has Open Graph information you can publish a post wiht it.

This plugin provides an easy framework to add Digg buttons and Digg widgets to your page. Digg buttons help drive traffic to your content by allowing easy Digging and submission into the Digg ecosystem. Digg widgets allow you to supplement your content with the top stories from Digg either through the lens of your site or through a specific area or topic from Digg.
Out of the box, it allows you to:
<ul>
<li>Place yellow smart Digg buttons in the three size options: compact, medium and large. The yellow smart Digg buttons can tell if a web page has been Dugg or not and displays the proper number count. </li>
<li>Generate a customized Digg widget with different placement options. The widget generator can show the most Dugg content by domain, topic, search term or even show a particular user’s Dugg stories. After selecting the type of content to display, it’s easy to save that state and decide where to position it on a page.</li>
</ul>
The Digg plugin is developed and maintained by Digg Inc. and will be updated regularly as new capabilities are introduced to the Digg platform.

Digg

The Digg plugin provides an easy framework to add Digg buttons and Digg widgets to your page.

Post from Open Graph vs Digg