Index: bp-activity/feeds/bp-activity-favorites-feed.php
===================================================================
--- bp-activity/feeds/bp-activity-favorites-feed.php
+++ bp-activity/feeds/bp-activity-favorites-feed.php
@@ -19,6 +19,8 @@ echo '<?xml version="1.0" encoding="' . get_option( 'blog_charset' ) . '"?'.'>';
 	xmlns:wfw="http://wellformedweb.org/CommentAPI/"
 	xmlns:dc="http://purl.org/dc/elements/1.1/"
 	xmlns:atom="http://www.w3.org/2005/Atom"
+	xmlns:sy="http://purl.org/rss/1.0/modules/syndication/"
+	xmlns:slash="http://purl.org/rss/1.0/modules/slash/"
 	<?php do_action('bp_activity_favorites_feed'); ?>
 >
 
@@ -31,7 +33,8 @@ echo '<?xml version="1.0" encoding="' . get_option( 'blog_charset' ) . '"?'.'>';
 	<pubDate><?php echo mysql2date('D, d M Y H:i:s O', bp_activity_get_last_updated(), false); ?></pubDate>
 	<generator>http://buddypress.org/?v=<?php echo BP_VERSION ?></generator>
 	<language><?php bloginfo_rss( 'language' ); ?></language>
-
+	<sy:updatePeriod><?php echo apply_filters( 'bp_rss_update_period', 'hourly' ); ?></sy:updatePeriod>
+	<sy:updateFrequency><?php echo apply_filters( 'bp_rss_update_frequency', '2' ); ?></sy:updateFrequency>
 	<?php do_action('bp_activity_favorites_feed_head'); ?>
 
 	<?php
@@ -52,10 +55,6 @@ echo '<?xml version="1.0" encoding="' . get_option( 'blog_charset' ) . '"?'.'>';
 					<![CDATA[
 					<?php bp_activity_feed_item_description() ?>
 
-					<?php if ( bp_activity_can_comment() ) : ?>
-						<p><?php printf( __( 'Comments: %s', 'buddypress' ), bp_activity_get_comment_count() ); ?></p>
-					<?php endif; ?>
-
 					<?php if ( 'activity_comment' == bp_get_activity_action_name() ) : ?>
 						<br /><strong><?php _e( 'In reply to', 'buddypress' ) ?></strong> -
 						<?php bp_activity_parent_content() ?>
@@ -63,6 +62,10 @@ echo '<?xml version="1.0" encoding="' . get_option( 'blog_charset' ) . '"?'.'>';
 					]]>
 				</description>
 
+				<?php if ( bp_activity_can_comment() ) : ?>
+					<slash:comments><?php bp_activity_comment_count(); ?></slash:comments>
+				<?php endif; ?>
+
 				<?php do_action('bp_activity_favorites_feed_item'); ?>
 
 			</item>
Index: bp-activity/feeds/bp-activity-friends-feed.php
===================================================================
--- bp-activity/feeds/bp-activity-friends-feed.php
+++ bp-activity/feeds/bp-activity-friends-feed.php
@@ -19,6 +19,8 @@ echo '<?xml version="1.0" encoding="'.get_option('blog_charset').'"?'.'>'; ?>
 	xmlns:wfw="http://wellformedweb.org/CommentAPI/"
 	xmlns:dc="http://purl.org/dc/elements/1.1/"
 	xmlns:atom="http://www.w3.org/2005/Atom"
+	xmlns:sy="http://purl.org/rss/1.0/modules/syndication/"
+	xmlns:slash="http://purl.org/rss/1.0/modules/slash/"
 	<?php do_action('bp_activity_friends_feed'); ?>
 >
 
@@ -31,6 +33,8 @@ echo '<?xml version="1.0" encoding="'.get_option('blog_charset').'"?'.'>'; ?>
 	<pubDate><?php echo mysql2date('D, d M Y H:i:s O', bp_activity_get_last_updated(), false); ?></pubDate>
 	<generator>http://buddypress.org/?v=<?php echo BP_VERSION; ?></generator>
 	<language><?php bloginfo_rss( 'language' ); ?></language>
+	<sy:updatePeriod><?php echo apply_filters( 'bp_rss_update_period', 'hourly' ); ?></sy:updatePeriod>
+	<sy:updateFrequency><?php echo apply_filters( 'bp_rss_update_frequency', '2' ); ?></sy:updateFrequency>
 	<?php do_action('bp_activity_friends_feed_head'); ?>
 
 	<?php if ( bp_has_activities( 'scope=friends&max=50&display_comments=stream' ) ) : ?>
@@ -43,18 +47,19 @@ echo '<?xml version="1.0" encoding="'.get_option('blog_charset').'"?'.'>'; ?>
 
 				<description>
 					<![CDATA[
-					<?php bp_activity_feed_item_description(); ?>
-
-					<?php if ( bp_activity_can_comment() ) : ?>
-						<p><?php printf( __( 'Comments: %s', 'buddypress' ), bp_activity_get_comment_count() ); ?></p>
-					<?php endif; ?>
+					<?php bp_activity_feed_item_description() ?>
 
 					<?php if ( 'activity_comment' == bp_get_activity_action_name() ) : ?>
-						<br /><strong><?php _e( 'In reply to', 'buddypress' ); ?></strong> -
-						<?php bp_activity_parent_content(); ?>
+						<br /><strong><?php _e( 'In reply to', 'buddypress' ) ?></strong> -
+						<?php bp_activity_parent_content() ?>
 					<?php endif; ?>
 					]]>
 				</description>
+
+				<?php if ( bp_activity_can_comment() ) : ?>
+					<slash:comments><?php bp_activity_comment_count(); ?></slash:comments>
+				<?php endif; ?>
+
 				<?php do_action('bp_activity_personal_feed_item'); ?>
 			</item>
 		<?php endwhile; ?>
Index: bp-activity/feeds/bp-activity-group-feed.php
===================================================================
--- bp-activity/feeds/bp-activity-group-feed.php
+++ bp-activity/feeds/bp-activity-group-feed.php
@@ -19,6 +19,8 @@ echo '<?xml version="1.0" encoding="'.get_option('blog_charset').'"?'.'>'; ?>
 	xmlns:wfw="http://wellformedweb.org/CommentAPI/"
 	xmlns:dc="http://purl.org/dc/elements/1.1/"
 	xmlns:atom="http://www.w3.org/2005/Atom"
+	xmlns:sy="http://purl.org/rss/1.0/modules/syndication/"
+	xmlns:slash="http://purl.org/rss/1.0/modules/slash/"
 	<?php do_action('bp_activity_group_feed'); ?>
 >
 
@@ -31,6 +33,8 @@ echo '<?xml version="1.0" encoding="'.get_option('blog_charset').'"?'.'>'; ?>
 	<pubDate><?php echo mysql2date('D, d M Y H:i:s O', bp_activity_get_last_updated(), false); ?></pubDate>
 	<generator>http://buddypress.org/?v=<?php echo BP_VERSION ?></generator>
 	<language><?php bloginfo_rss( 'language' ); ?></language>
+	<sy:updatePeriod><?php echo apply_filters( 'bp_rss_update_period', 'hourly' ); ?></sy:updatePeriod>
+	<sy:updateFrequency><?php echo apply_filters( 'bp_rss_update_frequency', '2' ); ?></sy:updateFrequency>
 	<?php do_action('bp_activity_group_feed_head'); ?>
 
 	<?php if ( bp_has_activities( 'object=' . $bp->groups->id . '&primary_id=' . $bp->groups->current_group->id . '&max=50&display_comments=threaded' ) ) : ?>
@@ -44,12 +48,13 @@ echo '<?xml version="1.0" encoding="'.get_option('blog_charset').'"?'.'>'; ?>
 				<description>
 					<![CDATA[
 						<?php bp_activity_feed_item_description() ?>
-
-						<?php if ( bp_activity_can_comment() ) : ?>
-							<p><?php printf( __( 'Comments: %s', 'buddypress' ), bp_activity_get_comment_count() ); ?></p>
-						<?php endif; ?>
 					]]>
 				</description>
+
+				<?php if ( bp_activity_can_comment() ) : ?>
+					<slash:comments><?php bp_activity_comment_count(); ?></slash:comments>
+				<?php endif; ?>
+
 				<?php do_action('bp_activity_group_feed_item'); ?>
 			</item>
 		<?php endwhile; ?>
Index: bp-activity/feeds/bp-activity-mentions-feed.php
===================================================================
--- bp-activity/feeds/bp-activity-mentions-feed.php
+++ bp-activity/feeds/bp-activity-mentions-feed.php
@@ -19,6 +19,8 @@ echo '<?xml version="1.0" encoding="'.get_option('blog_charset').'"?'.'>'; ?>
 	xmlns:wfw="http://wellformedweb.org/CommentAPI/"
 	xmlns:dc="http://purl.org/dc/elements/1.1/"
 	xmlns:atom="http://www.w3.org/2005/Atom"
+	xmlns:sy="http://purl.org/rss/1.0/modules/syndication/"
+	xmlns:slash="http://purl.org/rss/1.0/modules/slash/"
 	<?php do_action('bp_activity_mentions_feed'); ?>
 >
 
@@ -32,6 +34,8 @@ echo '<?xml version="1.0" encoding="'.get_option('blog_charset').'"?'.'>'; ?>
 	<pubDate><?php echo mysql2date('D, d M Y H:i:s O', bp_activity_get_last_updated(), false); ?></pubDate>
 	<generator>http://buddypress.org/?v=<?php echo BP_VERSION ?></generator>
 	<language><?php bloginfo_rss( 'language' ); ?></language>
+	<sy:updatePeriod><?php echo apply_filters( 'bp_rss_update_period', 'hourly' ); ?></sy:updatePeriod>
+	<sy:updateFrequency><?php echo apply_filters( 'bp_rss_update_frequency', '2' ); ?></sy:updateFrequency>
 	<?php do_action('bp_activity_mentions_feed_head'); ?>
 
 	<?php if ( bp_has_activities( 'max=50&display_comments=stream&search_terms=@' . bp_core_get_username( bp_displayed_user_id() ) ) ) : ?>
@@ -46,16 +50,17 @@ echo '<?xml version="1.0" encoding="'.get_option('blog_charset').'"?'.'>'; ?>
 					<![CDATA[
 					<?php bp_activity_feed_item_description() ?>
 
-					<?php if ( bp_activity_can_comment() ) : ?>
-						<p><?php printf( __( 'Comments: %s', 'buddypress' ), bp_activity_get_comment_count() ); ?></p>
-					<?php endif; ?>
-
 					<?php if ( 'activity_comment' == bp_get_activity_action_name() ) : ?>
 						<br /><strong><?php _e( 'In reply to', 'buddypress' ) ?></strong> -
 						<?php bp_activity_parent_content() ?>
 					<?php endif; ?>
 					]]>
 				</description>
+
+				<?php if ( bp_activity_can_comment() ) : ?>
+					<slash:comments><?php bp_activity_comment_count(); ?></slash:comments>
+				<?php endif; ?>
+
 				<?php do_action('bp_activity_mentions_feed_item'); ?>
 			</item>
 		<?php endwhile; ?>
Index: bp-activity/feeds/bp-activity-mygroups-feed.php
===================================================================
--- bp-activity/feeds/bp-activity-mygroups-feed.php
+++ bp-activity/feeds/bp-activity-mygroups-feed.php
@@ -19,6 +19,8 @@ echo '<?xml version="1.0" encoding="'.get_option('blog_charset').'"?'.'>'; ?>
 	xmlns:wfw="http://wellformedweb.org/CommentAPI/"
 	xmlns:dc="http://purl.org/dc/elements/1.1/"
 	xmlns:atom="http://www.w3.org/2005/Atom"
+	xmlns:sy="http://purl.org/rss/1.0/modules/syndication/"
+	xmlns:slash="http://purl.org/rss/1.0/modules/slash/"
 	<?php do_action('bp_activity_mygroups_feed'); ?>
 >
 
@@ -32,6 +34,8 @@ echo '<?xml version="1.0" encoding="'.get_option('blog_charset').'"?'.'>'; ?>
 	<pubDate><?php echo mysql2date('D, d M Y H:i:s O', bp_activity_get_last_updated(), false); ?></pubDate>
 	<generator>http://buddypress.org/?v=<?php echo BP_VERSION ?></generator>
 	<language><?php bloginfo_rss( 'language' ); ?></language>
+	<sy:updatePeriod><?php echo apply_filters( 'bp_rss_update_period', 'hourly' ); ?></sy:updatePeriod>
+	<sy:updateFrequency><?php echo apply_filters( 'bp_rss_update_frequency', '2' ); ?></sy:updateFrequency>
 	<?php do_action('bp_activity_mygroups_feed_head'); ?>
 
 	<?php
@@ -50,12 +54,13 @@ echo '<?xml version="1.0" encoding="'.get_option('blog_charset').'"?'.'>'; ?>
 				<description>
 					<![CDATA[
 						<?php bp_activity_feed_item_description() ?>
-
-						<?php if ( bp_activity_can_comment() ) : ?>
-							<p><?php printf( __( 'Comments: %s', 'buddypress' ), bp_activity_get_comment_count() ); ?></p>
-						<?php endif; ?>
 					]]>
 				</description>
+
+				<?php if ( bp_activity_can_comment() ) : ?>
+					<slash:comments><?php bp_activity_comment_count(); ?></slash:comments>
+				<?php endif; ?>
+
 				<?php do_action('bp_activity_mygroups_feed_item'); ?>
 			</item>
 		<?php endwhile; ?>
Index: bp-activity/feeds/bp-activity-personal-feed.php
===================================================================
--- bp-activity/feeds/bp-activity-personal-feed.php
+++ bp-activity/feeds/bp-activity-personal-feed.php
@@ -19,6 +19,8 @@ echo '<?xml version="1.0" encoding="'.get_option('blog_charset').'"?'.'>'; ?>
 	xmlns:wfw="http://wellformedweb.org/CommentAPI/"
 	xmlns:dc="http://purl.org/dc/elements/1.1/"
 	xmlns:atom="http://www.w3.org/2005/Atom"
+	xmlns:sy="http://purl.org/rss/1.0/modules/syndication/"
+	xmlns:slash="http://purl.org/rss/1.0/modules/slash/"
 	<?php do_action('bp_activity_personal_feed'); ?>
 >
 
@@ -31,6 +33,8 @@ echo '<?xml version="1.0" encoding="'.get_option('blog_charset').'"?'.'>'; ?>
 	<pubDate><?php echo mysql2date('D, d M Y H:i:s O', bp_activity_get_last_updated(), false); ?></pubDate>
 	<generator>http://buddypress.org/?v=<?php echo BP_VERSION ?></generator>
 	<language><?php bloginfo_rss( 'language' ); ?></language>
+	<sy:updatePeriod><?php echo apply_filters( 'bp_rss_update_period', 'hourly' ); ?></sy:updatePeriod>
+	<sy:updateFrequency><?php echo apply_filters( 'bp_rss_update_frequency', '2' ); ?></sy:updateFrequency>
 	<?php do_action('bp_activity_personal_feed_head'); ?>
 
 	<?php if ( bp_has_activities( 'user_id=' . bp_displayed_user_id() . '&max=50&display_comments=stream' ) ) : ?>
@@ -45,16 +49,17 @@ echo '<?xml version="1.0" encoding="'.get_option('blog_charset').'"?'.'>'; ?>
 					<![CDATA[
 					<?php bp_activity_feed_item_description() ?>
 
-					<?php if ( bp_activity_can_comment() ) : ?>
-						<p><?php printf( __( 'Comments: %s', 'buddypress' ), bp_activity_get_comment_count() ); ?></p>
-					<?php endif; ?>
-
 					<?php if ( 'activity_comment' == bp_get_activity_action_name() ) : ?>
 						<br /><strong><?php _e( 'In reply to', 'buddypress' ) ?></strong> -
 						<?php bp_activity_parent_content() ?>
 					<?php endif; ?>
 					]]>
 				</description>
+
+				<?php if ( bp_activity_can_comment() ) : ?>
+					<slash:comments><?php bp_activity_comment_count(); ?></slash:comments>
+				<?php endif; ?>
+
 				<?php do_action('bp_activity_personal_feed_item'); ?>
 			</item>
 		<?php endwhile; ?>
Index: bp-activity/feeds/bp-activity-sitewide-feed.php
===================================================================
--- bp-activity/feeds/bp-activity-sitewide-feed.php
+++ bp-activity/feeds/bp-activity-sitewide-feed.php
@@ -19,6 +19,8 @@ echo '<?xml version="1.0" encoding="'.get_option('blog_charset').'"?'.'>'; ?>
 	xmlns:wfw="http://wellformedweb.org/CommentAPI/"
 	xmlns:dc="http://purl.org/dc/elements/1.1/"
 	xmlns:atom="http://www.w3.org/2005/Atom"
+	xmlns:sy="http://purl.org/rss/1.0/modules/syndication/"
+	xmlns:slash="http://purl.org/rss/1.0/modules/slash/"
 	<?php do_action('bp_activity_sitewide_feed'); ?>
 >
 
@@ -31,6 +33,8 @@ echo '<?xml version="1.0" encoding="'.get_option('blog_charset').'"?'.'>'; ?>
 	<pubDate><?php echo mysql2date('D, d M Y H:i:s O', bp_activity_get_last_updated(), false); ?></pubDate>
 	<generator>http://buddypress.org/?v=<?php echo BP_VERSION ?></generator>
 	<language><?php bloginfo_rss( 'language' ); ?></language>
+	<sy:updatePeriod><?php echo apply_filters( 'bp_rss_update_period', 'hourly' ); ?></sy:updatePeriod>
+	<sy:updateFrequency><?php echo apply_filters( 'bp_rss_update_frequency', '2' ); ?></sy:updateFrequency>
 	<?php do_action('bp_activity_sitewide_feed_head'); ?>
 
 	<?php if ( bp_has_activities( 'type=sitewide&max=50&display_comments=threaded' ) ) : ?>
@@ -44,12 +48,13 @@ echo '<?xml version="1.0" encoding="'.get_option('blog_charset').'"?'.'>'; ?>
 				<description>
 					<![CDATA[
 					<?php bp_activity_feed_item_description() ?>
-
-					<?php if ( bp_activity_can_comment() ) : ?>
-						<p><?php printf( __( 'Comments: %s', 'buddypress' ), bp_activity_get_comment_count() ); ?></p>
-					<?php endif; ?>
 					]]>
 				</description>
+
+				<?php if ( bp_activity_can_comment() ) : ?>
+					<slash:comments><?php bp_activity_comment_count(); ?></slash:comments>
+				<?php endif; ?>
+
 			<?php do_action('bp_activity_personal_feed_item'); ?>
 			</item>
 		<?php endwhile; ?>