With many page IDs

post_csv.rb

require 'rubygems'
require 'httparty'
require 'json'
require 'csv'

PAGE_IDS = ['vitrue', 'buddymedia' ] # ... and so on
ACCESS_TOKEN = 'AAACEdEose0cBAMRhF8cj7Gzt1SpNxPwW28dHkXPDLjqRVo2gfxB3lpDDZCdBZAyYv4xn1mTLtJn7c5s6MTBjEIYC73QR7fU1wHxjGShgZDZD'

def url_for_posts(page_id, token=ACCESS_TOKEN)
  "https://graph.facebook.com/#{page_id}/posts?limit=500&access_token=#{token}"
end

def posts_for(page_id)
  response = HTTParty.get(url_for_posts(page_id))
  JSON.parse(response.body)['data']
end

def name
  @post["from"]["name"] rescue ''
end

def created_time
  @post["created_time"] rescue ''
end

def likes_count
  @post["likes"]["count"] rescue ''
end

def comments_count
  @post["comments"]["count"] rescue ''
end

def application_id
  @post["application"]["id"] rescue ''
end

contents = CSV.generate('', {}) do |csv|
  csv << ["name", "page id", "created_time", "likes count", "comments count", "application id"]

  PAGE_IDS.each do |page_id|
    posts_for(page_id).each do |post|
      @post = post
      puts row.inspect.to_s
      csv << [name, page_id, created_time, likes_count, comments_count, application_id]
    end
  end
end

File.open("result_" + Time.now.to_i.to_s + ".csv", 'w') {|f| f.write(contents)}