Calculate the percentage of tweets linking to a website that came from the Tweet button

counter.rb

#
# Before running:
#   $ gem install twitter
#
# To run:
#   $ ruby counter.rb plosone.org
#
# Context:
#   http://luigimontanez.com/2012/actually-social-media-buttons-work-really-well
#
require 'rubygems'
require 'twitter'

search_term = ARGV[0]
total_tweets = 0
from_button = 0
pages = 5

(1..pages).each do |page|

  Twitter.search(search_term, :rpp => 100, :page => page).each do |tweet|
    total_tweets += 1
    from_button += 1 if tweet.source =~ /Tweet Button/
  end

end

percentage = (from_button.to_f / total_tweets.to_f) * 100

puts "Search term: #{dx.plos.org}"
puts "Total tweets analyzed: #{total_tweets}"
puts "Tweets from button: #{from_button} (#{sprintf('%.1f', percentage)}%)"