Meta-externalads/1.1
UndecidedCommunity-sourcedThe webpage on Developers.facebook.com/docs/sharing/webmasters/crawler provides essential information regarding how Facebook's crawler interacts with websites to facilitate the sharing of content on the platform. It explains the role of the Facebook Crawler in fetching and reading the metadata of shared links to generate previews, like images, titles, and descriptions. The documentation outlines how webmasters can ensure their content is optimally shared on Facebook, providing guidelines for using Open Graph tags, which help define how URLs appear when shared. It also discusses common issues that webmasters may encounter, such as ensuring that their web servers respond correctly to requests made by the crawler and troubleshooting tips for resolving any problems with link previews. Additionally, the page highlights the tools available for testing and debugging how the Facebook Crawler processes a given URL, ultimately helping developers optimize their sharing strategy for better engagement on Facebook. For a complete and detailed read, you can refer to the official documentation on the Facebook Developers site.
Identification
IP ranges
Requests from Meta-externalads/1.1 originate from these published ranges. For strict verification, match the source IP against this list in addition to checking the user-agent and reverse-DNS.
Block or allow Meta-externalads/1.1
Add a Disallow rule for meta-externalads/1.1 (+https://developers.facebook.com/docs/sharing/webmasters/crawler) in your robots.txt file. You can also block at the server level using your web server configuration or CDN firewall rules to filter requests matching the user-agent string.
# Block Meta-externalads/1.1 from crawling your entire site User-agent: meta-externalads/1.1 (+https://developers.facebook.com/docs/sharing/webmasters/crawler) Disallow: / # Allow Meta-externalads/1.1 full access User-agent: meta-externalads/1.1 (+https://developers.facebook.com/docs/sharing/webmasters/crawler) Allow: /
Ensure your robots.txt allows meta-externalads/1.1 (+https://developers.facebook.com/docs/sharing/webmasters/crawler). Verify requests by checking the user-agent string.
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