BuddyPress.org

Just use the activity loop in your template with filters:

https://codex.buddypress.org/developer-docs/custom-buddypress-loops/the-activity-stream-loop/

<?php if ( bp_has_activities( 'object=blogs&action=new_blog_comment' ) ) : ?>

Using those filters the stream will only show blog comments made across the entire site.

Andy, good advice, but when someone has disabled activities (as I have) , this doesn’t work.

slicktig, look here:

http://wpmudev.org/project/Sitewide-recent-comments

It’s a litte bit complicatet for you have to create the tables on your own and there is no widget, but it works. I changed the plugin a litte bit and it runs on http://www.tastentango.de now. If I would be able, I would make a widget of it but I have to solve some other problems first.

Hope it helps for the moment.

http://1uthavi.adadaa.com/ada-wpmu-sitewide-feed-plugin/

not only has posts, pages, but also has comments for all around your WPMU installation blogs. I updated the plugin to include avatar’s of authors & many more.

I use separate feeds to display on front page [rss widget], so I can quickly check what’s my site’s activity

see at http://adadaa.com/

@skcsknathan001, second what @Andrea_r said. The plugin’s working very well in WPMU 2.9.2 with BP 1.2.3 using subdomain structures. I haven’t tested this yet in installs with subdirectory strucutres, but since all your other MU plugins – Ada Recent Posts, Ada List All, etc – work well in both structures per my experience, I don’t foresee any problems

In addition, kudos for adding an admin page for this plugin at Site Admin > Ada Site Feed to make it easier for others to input the correct feed URL’s The plugin’s full-feed also included the first five thumbnails of images I uploaded via BPGallery rc4 and published to activity stream – very cool.

Many thanks again..