Twitter: Ruby Script to auto follow

A ruby program to auto follow users who follow you. In this you can define a back list as well ( users that you would never want to follow even if they follow you)
 

Pre-requisites for auto follow script:

• Install Ruby 1.8.x
• Install rubygems and twitter gem ( Tested with 0.6.8 version )
  

#!/usr/bin/ruby

require 'rubygems'
require 'twitter'

username = 'username'
password = 'urpassword'

#Add the twitter users that you  don't want follow
never_follow = %w( spammy  hawaii_hotels click4click  fdgddf roOffers )

httpauth = Twitter::HTTPAuth.new(username, password)

twitter = Twitter::Base.new( httpauth)

# Query for the information, keep only the
# information we need.
filter = proc {|f| f.screen_name }

followers = []
friends = []

pageNo =1
begin
  fol = twitter.followers(:page => pageNo).map(&filter)
  puts "Got #{fol.length} followers in Page #{pageNo}"
  followers += fol
  pageNo+=1
end while fol.length > 0

puts "Total Followers: #{followers.length}"

pageNo =1
begin
  fri = twitter.friends(:page => pageNo).map(&filter)
  puts "Got #{fri.length} friends in Page #{pageNo}"
  friends += fri
  pageNo+=1
end while fri.length > 0

puts "Total Friends: #{friends.length}"

# Follow user, who follows you
# follow_list gives the list of twitter who follows you,
# but you are not following back

follow_list = followers - friends - never_follow
puts "No. of twitter profiles to autofollow #{follow_list.length}"
follow_list.each do |f|
  puts " http://twitter.com/#{f}"
  #print f," "
  begin
    twitter.friendship_create f
  rescue
    puts "Not able to follow: #{f}. Error: #{$!}"
  end
  # Sleep a few seconds, be nice to Twitter
  sleep 5
end