Fork of fb_scrape to accommodate changes in Ruby 2, native JSON and CSV libs, and insert pictures and links of posts when applicable.

fb_scrape.rb

# gem install rest-client
require 'json'
require 'rest_client'
require 'csv'
require 'cgi'
require 'uri'

# To use, get an access token here, by clicking "get access token" 
# and checking user.groups in the dialog box
# https://developers.facebook.com/tools/explorer?method=GET&path=209024949216061%2Ffeed
#
# Run `ruby fb_scrape.rb ACCESS_TOKEN GROUP_ID`
#
# Your CSV should show up as "fb_posts_GROUP_ID.csv" in the same directory. 

class GroupScraper
  def initialize(access_token, group_id)
    @access_token = access_token
    @group_id     = group_id
    @url          =  "https://graph.facebook.com/#{@group_id}/feed?access_token=#{@access_token}"
    @data         = []
  end

  def start
    scrape(@url)
  end

  def orig_url(fb_url)
    uri = URI.parse(fb_url)
    query = uri.query
    puts "query"
    puts query
    if query
      parsed_query = CGI.parse query
    end
    
    if parsed_query
      parsed_query["url"].join(" ")
    else
      fb_url
    end
  end

  def scrape(url)
    json_response = RestClient.get(url)
    resp = JSON.parse(json_response.strip)

    if resp['data'] && resp['data'].length > 0
      resp['data'].each do |fb_post|
        puts "PICTURE"
        puts fb_post["picture"]
        post = {
          :fb_id           => fb_post['id'],
          :fb_author       => fb_post["from"]["name"],
          :fb_author_id    => fb_post["from"]["id"],
          :message         => fb_post["message"],
          :fb_created_time => fb_post["created_time"],
          :fb_updated_time => fb_post["updated_time"],
          :picture         => (orig_url(fb_post["picture"]) if fb_post["picture"]),
          :link            => fb_post["link"]
        }
        p post
        @data << post
        if fb_post['comments'] && fb_post['comments']['data']
          fb_post['comments']['data'].each do |fb_comment|
            comment = {
              :fb_id           => fb_comment['id'],
              :fb_author       => (fb_comment["from"]["name"] if fb_comment && fb_comment["from"]),
              :fb_author_id    => (fb_comment["from"]["id"] if fb_comment && fb_comment["from"]),
              :message         => fb_comment["message"],
              :fb_created_time => fb_comment["created_time"],
              :fb_likes        => fb_comment['likes'],
              :picture      => (orig_url(fb_comment["picture"]) if fb_comment["picture"]),
              :link         => fb_comment["link"]
            }
            p comment
            @data << comment
          end
        end
      end
      
      if resp['paging']['next']
        scrape(resp['paging']['next'])
      end      
    else
      return
    end
  end

  def to_csv
    CSV.open("fb_posts_#{@group_id}.csv", "w") do |csv|
      csv << %w[name fb_id date text url picture link]
      @data.each do |post|
        csv << [post[:fb_author], post[:fb_id], post[:fb_created_time], post[:message], "https://www.facebook.com/groups/#{post[:fb_id].split(/_/)[0]}/permalink/#{post[:fb_id].split(/_/)[1]}", post[:picture], post[:link]]
      end
    end
  end
end

if __FILE__ == $0
  gs = GroupScraper.new(ARGV[0], ARGV[1])
  gs.start
  gs.to_csv
end

I am getting this error:

Traceback (most recent call last):
4: from fb_scrape.rb:102:in <main>' 3: from fb_scrape.rb:25:in start'
2: from fb_scrape.rb:49:in scrape' 1: from fb_scrape.rb:49:in each'
fb_scrape.rb:54:in block in scrape': undefined method []' for nil:NilClass (NoMethodError)