People you follow on Twitter who don't follow you.

fake_friends.rb

require 'twitter_oauth'
require 'pp'

consumer_key    = '<key>'
consumer_secret = '<secret>'
remote_id       = '<id>'
access_token    = '<token>'
user            = '<screen_name>'

# Add the users_lookup method
module TwitterOAuth
  class Client
    def users_lookup(options = {})
      args = options.map{|k,v| "#{k}=#{v}"}.join('&')
      get("/users/lookup.json?#{args}")
    end
  end
end

twitter = TwitterOAuth::Client.new(
  :consumer_key    => consumer_key,
  :consumer_secret => consumer_secret,
  :token           => remote_id,
  :secret          => access_token
)

followers = twitter.followers_ids :screen_name => user
friends   = twitter.friends_ids   :screen_name => user

fake_friends_ids = friends['ids'].select do |friend_id|
  !followers['ids'].include? friend_id
end

fake_friends = []

fake_friends_ids.each_slice(100) do |ids|
  users = twitter.users_lookup( :user_id => ids.join(',') )
  raise users['errors'].inspect if users.instance_of?(Hash) && users.has_key?('errors')
  fake_friends += users
end

pp fake_friends.map { |user| user['screen_name'].downcase }.sort

puts "\nYou have #{ fake_friends_ids.count } FAKE friends."