What is facebookexternalhit?
facebookexternalhit is Meta's web crawler that fetches content from apps or websites shared on Facebook, Instagram, or Messenger to gather, cache, and display information like titles, descriptions, and thumbnail images. You can set up Agent Analytics to see when facebookexternalhit visits your website.
Category
| Example User Agent | facebookexternalhit/1.1 (+http://www.facebook.com/externalhit_uatext.php) |
| Operated By | Meta |
| Source | Official Website |
| Identity |
Verified
Verified Identification
Requests claiming to be this agent can be authenticated using its published verification method. |
| Triggered By | Shared link |
| Used for AI Model Training | Not expected |
| Affects AI Chat & Search Visibility | Not directly |
| Expected To Follow Robots.txt | No |
Why Is facebookexternalhit Visiting My Website?
Someone shared a link to your page. facebookexternalhit fetched it to build a preview card, and each new share may trigger another request. A spike often means your content is circulating more widely.
Should I Block facebookexternalhit?
Usually not. Blocking facebookexternalhit may leave shared links without a title or image, making them less inviting to click. If it begins fetching at unexpected volume, try rate limiting before blocking it outright. For context, 3% of the top websites we track currently have robots.txt rules for facebookexternalhit.
Insights for facebookexternalhit
As of October 29, 2026, this data reflects agent visits measured across thousands of websites using Agent Analytics, combined with daily scans of the top 1000 websites and their robots.txt files.
Robots.txt Compliance
Country of Origin
Robots.txt Blocked Percentage
Frequently Asked Questions
What Traffic Patterns Should I Expect From facebookexternalhit?
facebookexternalhit usually makes a single request within seconds of a URL being shared, without crawling further. Traffic rises and falls with sharing activity, so a widely circulated link can produce a sharp burst of fetches.
Does facebookexternalhit Follow Robots.txt Rules?
No. facebookexternalhit is not expected to follow robots.txt rules, so a disallow rule only communicates your preference. Enforce the block with firewall or server rules, then use Agent Analytics to verify that its requests stop.
Is facebookexternalhit Used for AI Model Training?
Not ordinarily. facebookexternalhit is not categorized as an AI training scraper or data provider, so AI model training is not its expected purpose.
Does Blocking facebookexternalhit Affect AI Search or Citations?
Not directly. facebookexternalhit's expected purpose is not to supply an AI search index or retrieve pages for AI-generated answers.
Does facebookexternalhit Access Private Content?
No. facebookexternalhit has no credentials and should access only the public URL and assets needed for a preview. It does not continue through the rest of your site.
How Can I Verify a Request From facebookexternalhit?
Agent Analytics tracks visits from facebookexternalhit and every other known AI agent, crawler, and scraper, then authenticates each visit using facebookexternalhit's published verification method. You can also check your server logs for requests whose user-agent string contains "facebookexternalhit". Look for a page and its preview assets being requested without follow-up navigation. A matching log entry alone is not proof because any bot can claim to be facebookexternalhit.
How Is facebookexternalhit Different From Other Meta Agents?
Meta operates separate agents for different purposes, so each agent should be evaluated and controlled independently.
- Muse: Muse is a personal AI agent created by Meta that uses a web browser and connected apps to complete multi-step tasks such as filling out forms, booking travel, sending ema…
- meta-externalfetcher: meta-externalfetcher is used by Meta to perform user-initiated fetches of individual links from AI assistant product functions.
- FacebookBot: FacebookBot is a web crawler used by Meta to download training data for its AI speech recognition technology.
- meta-externalagent: meta-externalagent crawls web content for training AI models and improving Meta's products by indexing content directly across the internet.
- meta-webindexer: meta-webindexer is Meta's web crawler that browses the internet to improve search results for Meta AI users. It analyzes online content to make Meta AI's responses more r…