friend_suggest.rb

require 'rubygems'
require 'twitter'

base        = Twitter::Base.new(Twitter::HTTPAuth.new('username', 'password'))
my_friends  = base.friend_ids
candidates  = my_friends.inject(Array.new) { |array,id| array += Twitter.friend_ids(id); array }
candidates -= my_friends
tallied     = candidates.inject(Hash.new(0)) { |hash, can| hash[can] += 1; hash }
ordered     = tallied.sort { |x,y| y[1] <=> x[1] }

ordered[0..9].each do |array|
  user = base.user(array[0])
  puts "#{user.screen_name} is followed by #{array[1]} of the people you follow."
end