Twitterのリストに人を登録するRubyスクリプト ref: http://qiita.com/items/2339

config.yml

:user_name: YOUR NAME
:list_name: LIST NAME
:consumer_key: CONSUMER KEY
:consumer_secret: CONSUMER SECRET
:oauth_token: ACCESS TOKEN
:oauth_token_secret: ACCESS SECRET TOKEN

import_twilist.rb

#!/usr/bin/env ruby
# fork of https://gist.github.com/1790508 or http://qiita.com/items/2339

require 'open-uri'
require 'json'
require 'twitter'
require 'yaml'

config_path = File.expand_path(File.dirname(__FILE__) + '/config.yml')
twitter_config = YAML.load_file(config_path)

atnd_id = ARGV.first

url = "http://api.atnd.org/events/users/?format=json&event_id=#{atnd_id}"

json   = open(url).read
result = JSON.parse(json)
title  = result['events'][0]['title']
members = result['events'][0]['users']

p "#{title} -> are you sure? y/n"
answer =  STDIN.gets.chomp
exit unless answer == 'y'

members.map! do |member|
  member['twitter_id']
end.compact!.delete(twitter_config[:user_name])

Twitter.configure do |config|
  config.consumer_key = twitter_config[:consumer_key]
  config.consumer_secret = twitter_config[:consumer_secret]
  config.oauth_token = twitter_config[:oauth_token]
  config.oauth_token_secret = twitter_config[:oauth_token_secret]
end

begin
  before_list = Twitter.list(twitter_config[:username], twitter_config[:list_name])
  sleep 1
  list = Twitter.list_add_members(twitter_config[:user_name], twitter_config[:list_name], members)
  puts "List: #{list.full_name}"
  puts "Members: #{list.member_count}"
  if (list.member_count - before_list.member_count) < members.size
    puts "Warning: Some user{s} fail add to list..."
  end
rescue => ex
  puts ex.message
  raise ex
end

apiを通してmemberのtwitter idを取得するようにしました