Twitterで、ある人たち全員が共通でフォローしている人を調べる

twitter_friend.rb

#coding: utf-8

require "twitter"

Twitter.configure do |config|
  config.consumer_key = ""
  config.consumer_secret = ""
  config.oauth_token = ""
  config.oauth_token_secret = ""
end

member = ["user1", "user2", "user3", "user4"] #調べる対象の人たち

friend = Array.new
member.each{|user|
  if user == member[0] then
    friend = Twitter.friend_ids(user).ids
  else
    friend = Twitter.friend_ids(user).ids & friend
  end
}
friend.each{|user|
  puts Twitter.user(user).screen_name
}