Find your Twitter friends on Alpha (app.net)

twitter_friends_on_alpha.rb

require 'net/http'
require 'open-uri'
require 'json'

screen_name = ARGV[0]

if screen_name.nil?
  puts "ruby twitter_friends_on_alpha.rb twitter_username"
  exit
end

def twitter_friends(twitter_username)
  base_uri = "https://api.twitter.com/1/users/lookup.json?user_id="
  twitter_friend_ids(twitter_username).
    each_slice(60).each_with_object([]) { |ids_chunk, screen_names|
    screen_names << get_json(base_uri + ids_chunk.join(',')).map { |h|
      h.fetch('screen_name').downcase
    }
  }.flatten
end

def twitter_friend_ids(twitter_username)
  base_uri = "https://api.twitter.com/1/friends/ids.json?id="
  get_json(base_uri + twitter_username)['ids']
end

def get_json(url)
  JSON.parse open(url).read
end

def twitter_friends_on_alpha(screen_name)
  http = Net::HTTP.new('alpha.app.net', 443)
  http.use_ssl = true
  http.verify_mode = OpenSSL::SSL::VERIFY_NONE

  twitter_friends(screen_name).each_with_object([]) { |username, alpha_users|
    if http.request_head("/#{username}").code == "200"
      puts username
    end
  }
end

twitter_friends_on_alpha(screen_name)

Run:

$ ruby twitter_friends_on_alpha.rb your_twitter_username

This will output a list of your Twitter friends that have the same username on Alpha.

You can also use http://friendfind.co/

(It will also find friends that have a new username on http://alpha.app.net/)