新しいアカウントでフォローしなおすスクリプト。 u3, u4, u5 と追加していけば複数のアカウントで同時にフォローをかけることも可能。

transmigration.rb

require "twitter"
require "json"

USER1 = "account1" # もとのアカウント
USER2 = "account2" # 新しいアカウント
TOKEN_FILE = "twitter-token-list.json"

class FollowController

  def initialize(token)
    @client = Twitter::REST::Client.new do |config|
      config.consumer_key = token["consumer_key"]
      config.consumer_secret = token["consumer_secret"]
      config.access_token = token["oauth_token"]
      config.access_token_secret = token["oauth_token_secret"]
    end
  end

  def friends
    friends_list = Array.new
    @client.friends.to_a.each do |f|
      friends_list.push(f.id)
    end
    return friends_list
  end

  def follow(list)
    @client.follow(list)
  end

end

open(TOKEN_FILE) do |io|
  TOKEN = JSON.load(io)
end

u1 = FollowController.new(TOKEN[USER1])
u2 = FollowController.new(TOKEN[USER2])

u2.follow(u1.friends)

# u3 = FollowController.new(TOKEN[USER3])
# u3.follow(u1.friends)
# なんて感じで増やすことも

twitter-token-list.json

{
  "account1": {
    "consumer_key": "YOUR_CONSUMER_KEY",
    "consumer_secret": "YOUR_CONSUMER_SECRET",
    "oauth_token": "YOUR_ACCESS_TOKEN",
    "oauth_token_secret": "YOUR_ACCESS_TOKEN_SECRET"
  },
  "account2": {
    "consumer_key": "YOUR_CONSUMER_KEY",
    "consumer_secret": "YOUR_CONSUMER_SECRET",
    "oauth_token": "YOUR_ACCESS_TOKEN",
    "oauth_token_secret": "YOUR_ACCESS_TOKEN_SECRET"
  },
  "account3": {
    "consumer_key": "YOUR_CONSUMER_KEY",
    "consumer_secret": "YOUR_CONSUMER_SECRET",
    "oauth_token": "YOUR_ACCESS_TOKEN",
    "oauth_token_secret": "YOUR_ACCESS_TOKEN_SECRET"
  }
}