andreyk

The WP Ya.Share plugin adds to your blog a set of buttons to save URLs of your pages/posts in popular social networks (twitter, facebook, livejournal, vkontakte etc.).
Добавляет блок ‘Поделиться’ (Ya.Share, разработанный в yandex) для сохранения ссылки просматриваемой страницы вашего блога в популярных ‘социальных сервисах’ (вконтакте, жж, твиттер и т. д.).
It uses the Yandex Ya.share API; I shaped it into wordpress plugin with some options only.
The following options are available:
<ul>
<li>locate “ya.share” block either in the content of a page/single post or in the sidebar (as a new widget);</li>
<li>select a list of preferable social networks;</li>
<li>button/link/icon for expanded social networks list, or nothing;</li>
<li>left, right or centered location;</li>
<li>above or under the content;</li>
<li>inscription language. 
Please feel free to contact me with your questions or suggestions.</li>
</ul>

WP Ya Share

Adds the Yandex 'Share in social networks' block into posts or widget to simplify saving URLs of your blog pages into social networks.

bradvin

This plugin allows you to easily bookmark/favorite posts, pages and custom post types. When you ‘star’ a post a shortcut link will appear in the admin menu. 
Use this plugin if you constantly find yourself editing the same posts or pages, and are sick of showing the list of posts first, then finding the post, then clicking edit.
Steps to use
<ol>
<li>Go to Pages</li>
<li>Click the Star icon on a page.</li>
<li>Your page is now bookmarked!</li>
<li>Repeat for other pages you always edit.</li>
<li>Save time!</li>
</ol>
Plugin Features
<ul>
<li>Intuitive interface to bookmark posts using a star icon.</li>
<li>Zero settings! Activate and enjoy.</li>
<li>Works with posts, pages and any custom post types.</li>
<li>Dashboard widget listing all bookmarks.</li>
<li>Setting a bookmark is done in realtime with no page reload.</li>
<li>Bookmarks are added to the admin menu for quick access under a “Bookmarks” menu item.</li>
<li>Adds a Bookmarks view/filter to the listing pages.</li>
<li>Bookmark shortcuts are also grouped by post type within the WordPress admin bar.</li>
<li>Optional “Bookmark Title” quick edit field to customize menu labels</li>
</ul>
Filters
<ul>
<li><code>admin_bookmarks_post_types</code> – Filter to scope bookmarks to specific post types</li>
<li><code>admin_bookmarks_untitled_label</code> – Filter to customize the untitled label</li>
<li><code>admin_bookmark_feature-dashboard_widget</code> – Filter to disable the dashboard widget</li>
<li><code>admin_bookmark_feature-quick-edit</code> – Filter to disable the quick edit feature</li>
<li><code>admin_bookmark_feature-view</code> – Filter to disable the view feature</li>
<li><code>admin_bookmark_feature-admin-bar</code> – Filter to disable the admin bar feature</li>
</ul>
To disable a feature, add a small bit of custom code to your theme’s <code>functions.php</code> file:
<pre><code>add_filter( 'admin_bookmark_feature-dashboard_widget', '__return_false' );
</code></pre>

Admin Bookmarks

Bookmark your favorite posts, pages or custom post types within the WordPress admin

WP Ya Share vs Admin Bookmarks