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BuddyPress Activity tab is used to output a list of sitewide, member or member’s friends activity. This plugin gets tags from each new blog posts activity and shows the most commonly used. 
BuddyPress Activity Tags doesn’t work with single WordPress installation or Multisite installation without BuddyPress. It must be activated for all sites using “network activate” in the Administration Panel. 
The widget configuration and tags style is based on <a href="https://wordpress.org/extend/plugins/simple-tags/" rel="ugc">Simple Tags plugin</a> by <a href="https://profiles.wordpress.org/users/momo360modena/" rel="nofollow ugc">momo360modena</a>.
Translations
The plugin comes with Spanish and English translations, please refer to the <a href="https://codex.wordpress.org/Installing_WordPress_in_Your_Language" title="Installing WordPress in Your Language" rel="nofollow ugc">WordPress Codex</a> for more information about activating the translation. If you want to help to translate the plugin to your language, please have a look at the bp-activity-tags.pot file which contains all definitions and may be used with a <a href="http://www.gnu.org/software/gettext/" rel="nofollow ugc">gettext</a> editor like <a href="http://www.poedit.net/" rel="nofollow ugc">Poedit</a>. 
Currently in the following languages:
<ul>
<li>Italian</li>
<li>English</li>
<li>Serbian (sr_RS) by <a href="http://www.webhostinghub.com" rel="nofollow ugc">Webhostinghub.com</a></li>
</ul>
Features
<ul>
<li>Click tags.</li>
<li>Customizable activity tags page URI.</li>
<li>Recent activity posts with a selected tag are showed in a page which contents the shortcode: <code>[bp_activity_tags]</code></li>
<li>Customizable style sheet for widget and results page.</li>
<li>Select how to display tags.</li>
<li>The size and color of each tag is determined by how many times that particular tag has been assigned to posts.</li>
</ul>
<a href="http://agora.grial.eu/pfcgrial/bp-activity-tags/" rel="nofollow ugc">See the plugin page for more information</a>.

BuddyPress Activity Tags

Adds a widget that displays a tag cloud with tags from new blog posts in BuddyPress Activity tab. Tested up to BuddyPress 1.9.2

Bunty

Bili Plugins

Comment Mention lets you easily enable @mentions in your WordPress comments — no BuddyPress required!
When someone mentions a user by typing <code>@username</code> in a comment, the mentioned user receives an email notification. Perfect for blogs, communities, and discussion-based sites.
Key features:
<ul>
<li>Simple and lightweight — works with the native WordPress comment system.</li>
<li>Mention users by typing <code>@username</code>.</li>
<li>Sends customizable email notifications to mentioned users.</li>
<li>Backend settings to customize email subject and content.</li>
<li>Compatible with bbPress — mention users in forum topics and replies.</li>
<li>Compatible with WooCommerce – mention users in product reviews.</li>
</ul>
<h3>FREE Plugin Compatibility</h3>
<ul>
<li>bbPress – Mention users in topics & replies.</li>
<li>WooCommerce – Mention users in product reviews.</li>
</ul>
Watch it in action:
<iframe loading="lazy" class="youtube-player" width="750" height="422" src="https://www.youtube.com/embed/Nz47aKJhsKQ?version=3&rel=1&showsearch=0&showinfo=1&iv_load_policy=1&fs=1&hl=en-US&autohide=2&wmode=transparent" allowfullscreen="true" style="border:0;" sandbox="allow-scripts allow-same-origin allow-popups allow-presentation allow-popups-to-escape-sandbox"></iframe>
<h3>PRO Features</h3>
Upgrade to Comment Mention Pro to unlock advanced features:
<ul>
<li>Autocomplete search by first name, last name, or display name while mentioning.</li>
<li>Enable mentions in page comments.</li>
<li>Option to disable email notifications for mentions.</li>
<li>Future: Mention by first & last name (under development).</li>
<li>Extra controls for role-based mention restrictions.</li>
<li>Additional hooks and filters for developers.</li>
</ul>
🛠️ Go to wp-admin → Comment Mention to enable pro features. 
🔗 <a href="https://biliplugins.com/comment-mention-pro-product/" rel="nofollow ugc">Get Comment Mention Pro</a>
<blockquote>
Note: Requires Comment Mention plugin v1.3.0 or higher.
</blockquote>
<h3>Pro Plugin Compatibility</h3>
<ul>
<li><a href="https://gamipress.com/?ref=203" rel="nofollow ugc">GamiPress</a> — reward users with points, achievements, or ranks when they mention or get mentioned.</li>
<li><a href="https://memberpress.com/" rel="nofollow ugc">MemberPress</a> — integrate mentions into membership sites.</li>
</ul>
<h3>GitHub Repository</h3>
<a href="https://github.com/BhargavBhandari90/comment-mention" rel="nofollow ugc">https://github.com/BhargavBhandari90/comment-mention</a>

Comment Mention

Mention users in WordPress comments without needing BuddyPress! Automatically notify mentioned users via email. Also supports bbPress.

BuddyPress Activity Tags vs Comment Mention