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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

Andrew DS a11n

This plugin allows you to tag people and objects in your images by selecting a region of the image and add names, URLs and descriptions. Implements the jQuery-Notes plugin by Lukas Rydygel (http://jquery-notes.rydygel.de/) and the jQuery-autocomplete plugin by Dylan Verheul (http://code.google.com/p/jquery-autocomplete/).
See the <a href="http://www.alleba.com/blog/2010/09/29/wordpress-plugin-wp-pic-tagger/" rel="nofollow ugc">WP Pic Tagger homepage</a> for more complete and detailed information.
<h3>Usage</h3>
<h4>Enabling Tags on an Image</h4>
To tag an image, you need to assign the class “wp-tag-people-abc” or “wp-tag-objects-xyz” to your images through your blog’s HTML editor. ‘abc’ and ‘xyz’ must be unique strings of text to identify an image. Simply use the ‘Tag People’ or ‘Tag Objects’ buttons found in the editor to easily insert these tags.
To tag people, click the ‘Tag People’ button. This type of tag allows you to insert names of people and their website or blog URLs. The URL field may be left empty.
If you wish to tag objects, click the ‘Tag Objects’ button. This tag allows you to add only textual notes or descriptions.
Some samples:

If you have more than one image in your post, they must be assigned different classes:

Do not assign more than one class to an image, such as this:

Doing so will disable the tagging feature.
<h4>Tagging the Images</h4>
After writing your post, publish it or save it as draft. View or preview the blog post. You will notice that each of your images assigned with the required classes are loading tags. To begin tagging, click the button with the plus (+) sign found below the image.
Click on the image. Drag and resize the tag box to your desired location and size. To save the tag, click on the button with the check mark to save it.
To edit or delete a tag, right-click on the tag to make the necessary changes.
<h3>License</h3>
This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation.

WP Pic Tagger

Tag, caption, annotate pictures and images on your Wordpress blog.

BuddyPress Activity Tags vs WP Pic Tagger