I was updating my post accordingly: https://investor.fb.com/investor-events/event-details/2021/F... links to it.

I'm still curious, but less concerned. They appear to use Cloudflare, AWS for DNS, and registered through Godaddy. I just haven't figured out who runs it. I wouldn't be surprised if it if were via business wire, but I'm surprised it's hard to find out. Multiple companys' IR teams seem to use it based on some cursory querying.