require 'twitter'

# your Twitter credentials
twitter_username = ''
twitter_password = ''

# the user you'd like to check friends / followers for. Set to nil, or omit for your own list
search_user = ''

client = Twitter::Base.new(twitter_username,twitter_password)

page = 1
full_friends_list = []
loop do
  begin
    puts "fetching page #{page}"
    followers = c.followers_for(search_user, :page => page)
    full_friends_list += followers.map { |u| u.screen_name }
    break if followers.empty?
    page = page + 1
  rescue
    break
  end
end

full_friends_list.sort