You're right. Fb doesn't seem to be using letsencrypt. https://crt.sh/?q=faceboo...

		gprasanth on Oct 4, 2021 \| parent \| context \| favorite \| on: Facebook-owned sites were down You're right. Fb doesn't seem to be using letsencrypt. https://crt.sh/?q=facebook.com On a side note, the amount of phishing sites using letsencrypt and having a domain similar to facebook.com is quite appalling.