BuddyPress - Merge both blog posts and BP Groupblog posts together when using the "Recent Networkwide Posts" widget.

ray-bp-all-blog-posts.php

/**
 * Merges both blog posts and groupblog posts together when using the "Recent
 * Networkwide Posts" widget supplied by BuddyPress.
 */
function ray_merge_blog_posts_and_groupblog_posts( $retval ) {
	// check the Recent Networkwide Posts activity args
	// make sure they all match
	if ( 'new_blog_post' === $retval['action'] && 
		0 == $retval['user_id'] &&
		false == $retval['scope'] &&
		false == $retval['object'] &&
		false == $retval['primary_id']
	) {
		// override the action to search for blog and groupblog posts
		$retval['action'] = 'new_blog_post,new_groupblog_post';
	}

	return $retval;
}
add_filter( 'bp_after_has_activities_parse_args', 'ray_merge_blog_posts_and_groupblog_posts' );