Metehan: ChatGPT uses PSL to treat Domains & Subdomains differently

Key Takeaways:

• Metehan identified traces of ChatGPT using PSL to differentiate domains and subdomains

The Public Suffix List (PSL) is a Mozilla-maintained, open catalog of domain suffixes that defines ownership boundaries on the web

• Why it is useful:

  • Attribute authority at the ownership level rather than the subdomain level

  • Therefore, differentiate domains owned from content of multi tenant sites such as *.github.io, *.notion.site, *.vercel.app, medium.com etc.

• Parasite SEO is a thing for ChatGPT: push documents into visibility using strong authority pages

• If you wanna build authority for your site: you have to publish on your site uniquely

Client-side traces in the .js response

Sources:

• https://www.linkedin.com/posts/metehanyesilyurt_quick-discovery-the-small-piece-of-domain-share-7393587381733343232-0jk4/

• https://metehan.ai/blog/how-chatgpt-uses-the-public-suffix-list/

• https://publicsuffix.org/list/public_suffix_list.dat