aliciagh

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

jstnlngls

This was built out of a need for a way to bring registered users into a conversation unfolding in comments on posts. I work with an art collective and we’re all posting multiple posts on multiple topics and as we’ve tried to shift more and more of our conversations out of email and onto our website, there didn’t seem to be an easy way to bring specific people into these comment conversations without using a more general comment notification plugin. Notify Tagged User attempts to change that.
This plugin would help out any multi author blogs, and in particular, teams or project blogs that focus on internal communication.
Basically the plugin works by using the familiar Twitter @user reply syntax in the following way: 
-check all new comments for the @user syntax 
-if tagged users are found, look through the database for registered users’ nicknames matching the tagged user 
-if a registered user’s nickname is found, get the associated email address 
-send an email to all users tagged asking them to join in on the conversation

Tagged User Notification

This plugin allows you to tag other registered users on your blog in a comment in order to bring them into a conversation they might otherwise be miss …

BuddyPress Activity Tags vs Tagged User Notification