Boone Gorges

reblevins

Mariusooms

Requires BuddyPress 1.7+ and PHP 5.3+.
The BuddyPress Groupblog plugin extends the group functionality by enabling each group to have a single blog associated with it. Group members are automatically added to the blog and will have blog roles as set by the groupblog admin settings.
Features:
<ul>
<li>P2 integration and frontend posting.</li>
<li>Admin can set Template specific groupblogs.</li>
<li>Allow group admins choose the desired template page themselves.</li>
<li>Full blog theme integration. The included bp-groupblog theme mimics the group pages.</li>
<li>Automated blog registration at group creation stage.</li>
<li>Bypass default blog validation to allow dashes, underscores, numeral only and minimum character count.</li>
<li>Blog privacy settings are initially inherited from group privacy settings.</li>
<li>Group members are automatically added to the blog.</li>
<li>Blog roles match group roles as set by the group admin.</li>
<li>Solid error checking that the blog follows validation.</li>
<li>Group admin tab to access the group-blog settings.</li>
<li>Blog themes will have the ability to pull in group info and create a theme that could resemble the group exactly.</li>
<li>Leaving the group will downgrade the member role to ‘subscriber’.</li>
<li>Allow the group admin to select one of his/her existing blogs.</li>
<li>A new ajax backend.</li>
</ul>

BuddyPress Groupblog

BuddyPress Groupblog extends the group functionality by enabling the group to have a single blog associated with it.

husani

Searches various data sources (Google Blog Search and Twitter) for posts related to your content and displays links/summaries on your page or 
inside your posts. These links and summaries can be displayed anywhere and any way you wish — below your post, in a sidebar, etc. With the 
magic animation power of jQuery, SMIRC content can be hidden until a user clicks the customizable header.
SMIRC performs related content searching (at least in this version) by creating RSS feed URLs for the various data sources. The RSS feed is 
parsed and converted into XHTML for display in your blog.
All PHP is separated into logical classes and files, and all XHTML is standards-compliant. Lists of links, authors, and summaries are built 
using standard UL and LI tags, and can be modified to fit your theme via two CSS files contained within this plugin.
SMIRC is released to the WordPress community under the GPL. Please feel free to modify as you see fit, and if you find this plugin useful, donate 
to the author. All feedback is welcome at wordpressplugins@husani.com, and you can visit the author’s websites at http://www.husani.com and 
http://www.evb.com.
UPDATE FOR v1.1: Fixed a bug with setting header text.

Social Media Integrated Related Content (SMIRC)

Like trackbacks, but not -- this plugin searches and displays content related to your CONTENT, not just posts that link to yours.

BuddyPress Groupblog vs Social Media Integrated Related Content (SMIRC)