Facebook doesn't let any random bot crawl Facebook with scrapers. If you go to: https://www.facebook.com/robots.txt https://www.facebook.com/robots.txt it say

Facebook doesn't let any random bot crawl Facebook with scrapers. If you go to: https://www.facebook.com/robots.txt https://www.facebook.com/robots.txt it says: # Notice: if you would like to crawl Facebook you can # contact us here: http://www.facebook.com/apps/site_scraping_tos.php http://www.facebook.com/apps/site_scraping_tos.php # to apply for white listing. Our general terms are available # at http://www.facebook.com/apps/site_scraping_tos_terms.php http://www.facebook.com/apps/site_scraping_tos_terms.php (Then there's a bunch of "Disallow:" statements for Baidu, Google, etc.) If you follow the link, you can apply to Facebook for permission to do "automated data collection." Even if you do get permission, Facebook is very restrictive with what you're allowed to do with the scraped data.