Safe Reported Social Bots

Facebook Crawler

Operated by Meta

Quick Facts

User-Agent:
FacebookBot
Category:
Social Bots
Operator:
Meta
Safety:
Safe
Blocking Impact:
Low - No SEO ranking impact
SEO Impact Score:
2/10
Official docs:
None published by Meta
Named by:
ai.robots.txt

Reported, not operator documented

Meta has not published a crawler page that names FacebookBot. It is listed here because a credible public source does: ai.robots.txt. Historic Meta token. Meta's current crawler page no longer lists it; registries still do.

What that means for you: the robots.txt rule on this page is the best available spelling, and a well-behaved crawler using this string will honour it, but there is no vendor statement of purpose, crawl rate or robots.txt compliance to rely on. Treat a matching request in your logs as a detection clue, not proof of who sent it, and combine the rule with a firewall rule if the traffic matters to you. If the operator publishes documentation, this profile moves to Official docs.

What is Facebook Crawler?

Facebook Crawler is an AI crawler operated by Meta. It uses the user-agent string FacebookBot and follows the Robots Exclusion Protocol.

Facebook Crawler is an AI crawler operated by Meta. It uses the user-agent string FacebookBot and follows the Robots Exclusion Protocol.
Facebook Crawler uses the user-agent token FacebookBot. You can control it via robots.txt, meta tags (noai), or the emerging llms.txt standard. Robots.txt is voluntary; for hard enforcement, combine it with server-level IP blocking.

What happens if you block Facebook Crawler?

🔶 AI Visibility Trade-off - Blocking Facebook Crawler will not hurt Google or Bing rankings, but it can remove your content from AI search answers and assistant citations powered by this crawler. Block only if you have a deliberate reason.
Generally safe to allow; provides legitimate crawling value.

How to block Facebook Crawler with robots.txt

<code>User-agent: FacebookBot</code> - Matching is case-insensitive. Robots.txt is fetched from the root of each subdomain separately.

Block completely (robots.txt)
User-agent: FacebookBot Disallow: /
Allow all (robots.txt)
User-agent: FacebookBot Allow: /
Block private only (robots.txt)
User-agent: FacebookBot Disallow: /private/ Disallow: /api/ Disallow: /admin/ Allow: /
Nginx server block
# Nginx: Hard-block Facebook Crawler if ($http_user_agent ~* "FacebookBot") { return 403 "Bot blocked"; }
Apache .htaccess
# Apache: Hard-block Facebook Crawler SetEnvIfNoCase User-Agent "FacebookBot" bad_bot Order Allow,Deny Allow from all Deny from env=bad_bot
Meta robots tag
<meta name="robots" content="noindex, nofollow">
X-Robots-Tag header
X-Robots-Tag: noindex, nofollow

Is Facebook Crawler safe to allow?

Facebook Crawler is rated Safe in this directory, meaning there are no credible public reports of abusive crawling under this name. It is a Reported token: Meta has not published documentation for it, so its purpose, crawl rate and robots.txt behaviour are not confirmed by the operator, and anyone can send the same user-agent string. Allow or block it on its stated purpose, and back the robots.txt rule with a firewall rule if the traffic matters to you.
Meta publishes no IP ranges or reverse-DNS pattern for Facebook Crawler, so the user-agent string cannot be verified. Rate-limit unusual volume instead of trusting the name.

What does Facebook Crawler do?

Understanding Facebook Crawler's purpose helps you decide whether to allow or block it.

  • Indexes web pages for AI-powered search answers
  • Surfaces your content as citations inside AI search results
  • Builds a knowledge index used to answer user questions
  • Allowing it can increase visibility in AI search
  • robots.txt behaviour not documented by the operator

Frequently Asked Questions

What user-agent string does Facebook Crawler use?
Facebook Crawler is reported to identify itself with FacebookBot. That spelling comes from ai.robots.txt, not from Meta, which has not published crawler documentation naming it. Use it in robots.txt as the best available match, and treat a request carrying it as a clue rather than proof of who sent it.
Is Facebook Crawler safe?
Facebook Crawler is rated Safe in this directory, meaning there are no credible public reports of abusive crawling under this name. It is a Reported token: Meta has not published documentation for it, so its purpose, crawl rate and robots.txt behaviour are not confirmed by the operator, and anyone can send the same user-agent string. Allow or block it on its stated purpose, and back the robots.txt rule with a firewall rule if the traffic matters to you.
Will blocking Facebook Crawler hurt my SEO?
🔶 AI Visibility Trade-off - Blocking Facebook Crawler will not hurt Google or Bing rankings, but it can remove your content from AI search answers and assistant citations powered by this crawler. Block only if you have a deliberate reason.
How do I block Facebook Crawler in robots.txt?
Add the following lines to your /robots.txt file:
User-agent: FacebookBot
Disallow: /

This instructs Facebook Crawler not to crawl any path on your site. To block only specific sections, replace / with the path (e.g., Disallow: /blog/).
Does Facebook Crawler respect robots.txt?
Not documented. Meta has published no statement that Facebook Crawler reads robots.txt. A rule for FacebookBot will stop a client that chooses to honour it; for enforcement, add a firewall or CDN rule as well.
How do I verify if Facebook Crawler is crawling my site?
Search your access logs for FacebookBot (for example grep -i "FacebookBot" /var/log/nginx/access.log). Because the operator publishes no IP ranges or reverse-DNS pattern, a match shows that something used the name, not that Meta sent it.

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