Index: src/wp-admin/includes/dashboard.php
===================================================================
--- src/wp-admin/includes/dashboard.php	(revision 26348)
+++ src/wp-admin/includes/dashboard.php	(working copy)
@@ -43,7 +43,8 @@
 		wp_add_dashboard_widget( 'network_dashboard_right_now', __( 'Right Now' ), 'wp_network_dashboard_right_now' );
 
 	// Activity Widget
-	wp_add_dashboard_widget( 'dashboard_activity', __( 'Activity' ), 'wp_dashboard_activity' );
+	if ( is_blog_admin() )
+		wp_add_dashboard_widget( 'dashboard_activity', __( 'Activity' ), 'wp_dashboard_activity' );
 
 	// QuickPress Widget
 	if ( is_blog_admin() && current_user_can( 'edit_posts' ) )