code: def safelist(*args)
        list = flatten_list_of_strings(args)
  
        if list.nil? || list.empty?
          bot.safelist = []
        else
          bot.safelist += list
        end
      end
docs: specify a bot-specific safelist of users.  accepts an array, or a
   comma-delimited string. when called, any subsequent calls to
   search or replies will only act upon these users.
  
   @param [Array, String] args list of usernames or Twitter::User objects
   @example
     safelist "mean_user, private_user"