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Meta-ExternalFetcher
Meta-ExternalFetcher is a Meta user-requested fetcher for AI and link features across Meta products.
Reads a page when someone asks Meta AI about it.
- Meta-ExternalAgentTrainingNot checked
- Meta-WebIndexerSearchNot checked
- Meta-ExternalFetcherUser fetchNot checked
Reads your live robots.txt and applies the same rules these crawlers use. Nothing is stored.
- robots.txt token
Meta-ExternalFetcher- Follows robots.txt
- Not always
- How to verify it
- Not published
- Seen on
- Not measured
- Last checked
- 11 June 2026
Should you block Meta-ExternalFetcher?
Usually not. It reads a page only when a person asks Meta AI about it, so blocking it hides your page from someone already looking for it.
| Meta bot | Job | If you block it |
|---|---|---|
| Meta-ExternalAgent | Training | Blocking it opts your site out of this direct Meta AI crawling path, but does not cover every Meta user-triggered fetcher. |
| Meta-WebIndexer | Search | Allowing it can help Meta AI cite and link to your content; blocking it can reduce Meta AI search visibility. |
| Meta-ExternalFetcherThis page | User fetch | A hit usually represents an on-demand fetch for a specific URL rather than broad crawling. |
| facebookexternalhit | Other | Blocking it can break rich link previews and Open Graph extraction in Meta surfaces. |
| meta-externalads | Other | Blocking it limits Meta’s crawling for those advertising and business uses. Meta documents separate crawlers for link previews, AI, and user-requested fetches. |
About robots.txtMeta documents that this fetcher may bypass robots.txt because it performs user-requested fetches.
User-agent: Meta-ExternalFetcher
Disallow: /Asks Meta-ExternalFetcher not to crawl any page. Other Meta bots are unaffected. Add it to the robots.txt file at the root of your site, above any wider rules.
Meta-ExternalFetcher fires when a real user's question pulls in your page. To know how often Meta AI reaches for your brand at all, track your brand mentions in Meta AI.
Also seen under Meta’s name, but not in its current documentation: FacebookBot. Rules naming them control no documented Meta crawler.
Spot it in your logs.
Match the name, then check where the request came from. Anyone can copy a user-agent. Search your own logs for Meta-ExternalFetcher.
meta-externalfetcher/1.1 (+https://developers.facebook.com/docs/sharing/webmasters/web-crawlers)Version numbers change. Match the highlighted name, not the whole string.
- 1
Match the name
Search your server or CDN log for
Meta-ExternalFetcher, case-insensitive. A match is a clue, not proof. - 2
Check the source
Meta publishes no IP ranges, reverse DNS or signatures for Meta-ExternalFetcher in the sources here, so it cannot be verified. Treat matches as unconfirmed.
Serve the content in HTML
The cited operator material does not verify JavaScript rendering. Serve useful HTML before client-side JavaScript where possible.
Questions, answered.
Meta-ExternalFetcher is a Meta user-requested fetcher for AI and link features across Meta products.
Sources.
Officially documented. Operator facts and Trakkr’s measurements keep separate dates.
- [1]Meta crawler documentation
Officially documented · checked 11 June 2026
developers.facebook.com/docs/sharing/webmasters/web-crawlers/
First verified 11 June 2026. Last source check 11 June 2026.
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See which AI crawlers read your site.
Trakkr shows which bots, Meta-ExternalFetcher included, visit which pages each day, and whether the answers they feed mention you.
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