Good afternoon, Out of curiosity Is it possible that the certificate that expired on 9/30/2021, is affecting social networks such as facebook, instagram, whatsapp? .
Do you have version control?
Are there compatibility issues?
Thank you for accepting me in the community, if I can contribute in something let me know, I am a software developer and I do pentesting. I speak Spanish too.
Currently, there's a global outage for those sites/apps, so probably not related.
Welcome to the Let's Encrypt Community, Sebastian 
If you stay around, I'm sure you'll find many ways to contribute here. We're always happy for the help.
Interesting blog by Cloudflare about the Facebook problem:
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