Re: Adding Recent Replies to Site Wide Activity
Activities are created by plugins that add those activities to 1 large table in the database that can be sorted in many ways; user, activity type, etc…
What you would need to do is create a little mini plugin to hook into the bbPress posting actions, and have that generate an activity that you will also need to create.
It’s easier than it sounds. Check out buddypress/bp-activity/bp-activity-classes.php and… function bp_activity_add( $args = '' ) {in buddypress/bp-activity.php for some direction. 
