# facebookexternalhit

Bot · Assistants fetching for a user · Link previews · operated by meta

**Identity:** Names itself in its user agent only.

## How to recognise it

- User agent contains `facebookexternalhit`, `meta-externalads`

## With Double Agent

Sessions from facebookexternalhit are labelled `bot` with `agent_id: meta.facebookexternalhit`, and tagged in your analytics. Nothing is blocked unless you choose to. Install: https://doubleagent.so/install.md

Source: https://developers.facebook.com/docs/sharing/webmasters/web-crawlers