Get the total number of favorites accumulated by a user on his activities

/**
 * Get the total no. of favorites accumulated by a user on his activities 
 * @global type $bp
 * @global type $wpdb
 * @param int $user_id
 * @return int count of total favories by other users on given users activity 
 */
function bpdev_count_user_acivity_favs( $user_id ){

    global $bp, $wpdb;
    $query =$wpdb->prepare("SELECT SUM(meta_value) as total FROM {$bp->activity->table_name_meta} WHERE meta_key = %s AND activity_id IN ( SELECT id FROM {$bp->activity->table_name} WHERE user_id = %d)", 'favorite_count', $user_id );


    return (int) $wpdb->get_var( $query );

}

#activity, #bp-hacks