This is the Vikinghammer Tweet plugin.
You can set it up to post tweets based on new posts or comments to your blog. This requires that you enter your Twitter credentials.

Vikinghammer Tweet

Send a tweet for any new post or comment to your blog.

Timur Kamaev

Kama WP Smiles enhances your WordPress experience by seamlessly incorporating a smiley block into the comment form of your theme and the HTML/visual editor in the admin panel. This feature simplifies the process of adding smiles to your comments or posts. The plugin replaces the standard WordPress emoticons with lively and animated GIF smileys.
With Kama WP Smiles, visitors to your blog can effortlessly insert smiles into their comments, while you gain the ability to enhance your posts or respond to comments with smiles of your own.
In the plugin settings, you have the option to select which smileys appear in the smiley block. Additionally, you can customize the special codes, such as 🙂 , which trigger the replacement with smiley images in your content. Furthermore, you have the freedom to create and utilize your own set of smiley images.
Should you decide the plugin isn’t for you, uninstalling it is a breeze. The plugin ensures a clean removal process, leaving no trace behind.
<a href="http://wp-kama.ru/185" rel="nofollow ugc">Plugin page</a>

Kama WP Smiles

Replace WordPress emoticons with dynamic smileys, adding a smiley block to comment forms and admin editor. Pick from existing or create custom sets.

Vikinghammer Tweet vs Kama WP Smiles