brasofilo

The plugin adds a meta box where you can upload or select an image from your media library.
After selection, the default Link Image field is populated with the image URL and a preview is available in the meta box.
The plugin also adds a Thumbnail column in the page /wp-admin/link-manager.php
Inspired by <a href="http://wordpress.stackexchange.com/questions/44902/uploading-images-for-links" rel="nofollow ugc">this question</a> in WordPress Answers.
<h4>Localizations</h4>
Português & Español

Featured Link Image

Add a meta box in the Links add/edit page for easy uploading/inserting images in your bookmarks.

utahta

This plugin inserts social share links at the top or bottom of each post. 
For theme developers, social share links can be added by PHP code or by using shortcode. Check documentation for this use-case.
This plugin documentation can be found <a href="https://github.com/utahta/WP-Social-Bookmarking-Light/wiki" rel="nofollow ugc">here</a>.
This is the list of used social sites:
<ul>
<li>Hatena</li>
<li>Facebook Like Button</li>
<li>Facebook Share Button</li>
<li>Facebook Send Button</li>
<li>Twitter</li>
<li>Tumblr</li>
<li>Google Bookmark</li>
<li>Google +1</li>
<li>Delicious</li>
<li>Digg</li>
<li>reddit</li>
<li>LinkedIn</li>
<li>Instapaper</li>
<li>StumbleUpon</li>
<li>mixi Check</li>
<li>mixi Like</li>
<li>GREE Social Feedback</li>
<li>atode (toread)</li>
<li>LINE</li>
<li>Pocket</li>
<li>Pinterest</li>
</ul>

WP Social Bookmarking Light

This plugin inserts social share links at the top or bottom of each post.

Featured Link Image vs WP Social Bookmarking Light