{
 "slug": "facebookexternalhit",
 "name": "facebookexternalhit",
 "operator": "Meta",
 "operator_slug": "meta",
 "category": "preview",
 "category_label": "Link preview fetchers",
 "robots_token": "facebookexternalhit",
 "user_agent_substring": "facebookexternalhit",
 "user_agent_example": "facebookexternalhit/1.1 (+http://www.facebook.com/externalhit_uatext.php)",
 "respects_robots_txt": "documented",
 "respects_robots_txt_label": "obeys robots.txt (documented)",
 "verification_method": "none",
 "verification_label": "no published verification method",
 "published_ip_ranges_url": null,
 "ip_ranges_endpoint": null,
 "ipv4_prefix_count": 0,
 "ipv6_prefix_count": 0,
 "what_it_is": "The link unfurler: it reads your Open Graph tags when somebody shares your URL on a Meta property.",
 "cost_of_blocking": "Severe and usually accidental. Your links share as bare grey boxes with no title, image or description across Facebook, Instagram, Messenger and WhatsApp. Almost nobody means to block this.",
 "operator_docs": "https://developers.facebook.com/docs/sharing/webmasters/web-crawlers",
 "html_url": "https://www.pathwren.workers.dev/crawler/facebookexternalhit.html",
 "json_url": "https://www.pathwren.workers.dev/crawler/facebookexternalhit.json",
 "last_reviewed": "2026-09-01"
}