Kelvin Ng

This plugin enables blog owners to allow some shortcodes to be used in comments. You can choose what to allow (i.e. Whitelist some shortcodes). It only affects shortcodes in comments, but not in pages, posts, etc. All shortcodes are default to be disabled.
<a href="http://www.kelvinblog.tk/my-wordpress-plugins/shortcode-in-comment-page" rel="nofollow ugc">Plugin Homepage</a>
<h4>Settings</h4>
<ol>
<li>Visit ‘Settings > Shortcode in Comment’ to set what shortcodes are enabled in comments.</li>
<li>Type your shortcode(s) to be enabled in the text box (comma seperated for more than one)</li>
<li>Click ‘Save Changes’ to submit.</li>
</ol>

Shortcode in Comment

Enables blog owners to allow some shortcodes to be used in comments. You can choose what to allow.

Aram Zucker-Scharff

Response Stack uses WordPress shortcodes to pull comments (and comment threads) into a post from other posts on the same site. Authors can use threaded comments and even pull comments from multiple other stories, based on the comment ID. To get the shortcode working type the following into its own line in your post:
<pre><code>[responser comment="id" thread="depth"] where `id` is equal to the integer ID of the comment and `depth` is equal to the integer depth of the thread of comments you want visible. 
</code></pre>
Readers looking at the comments can even respond to them within the shortcode’s post, submitting threaded replies that will then take them to the original conversation.
You can find the comment id by looking at the hyperlink attached to any comment datetime stamp (on the post or in the comments page of the dashboard), where it will be in the format of <code>http://site/post-link/#comment-CommentIDNumber</code>.
Response Stack assumes you are using default WordPress comments. Support for other commenting systems is to come. If you’d like to add support for your commenting system, contribute to the project <a href="https://github.com/CFOPublishing/response-stack/" rel="nofollow ugc">GitHub</a>
Developed for <a href="http://cfo.com" rel="nofollow ugc">CFO Magazine</a>
Styling and format based on work with Human Made.
<pre><code>This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License, version 2, as published by the Free Software Foundation. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA </code></pre>

Response Stack

Response stack engages with your community by bringing audience comments into your posts.

Shortcode in Comment vs Response Stack