gistfile1.rb

require 'json'
require 'httparty'

class Page
  FBURL = "http://api.facebook.com/restserver.php"
  APIVER = "1.0"
  def self.fan_count
    params = {
      "method" => "Pages.getInfo",
      "api_key" => KEY,
      "v" => APIVER,
      "fields" => "fan_count",
      "page_ids" => "21956400441",
      "format" => "JSON"  }

    arg_string = params.sort.inject("") { |a,b| a << b.join("=") }
    params["sig"] = Digest::MD5.hexdigest("#{arg_string}#{SECRET}")
    response = HTTParty.post(FBURL,:body => params)
    JSON.parse(response.body)[0]["fan_count"]
  end
end

while true do
  puts "#{Time.now} => #{Page.fan_count}"
  sleep(300)
end