It seems that Meta assigns a unique hostname to each shared conversation. For example:
> fiscal-review-b4a5ff.cf.metaaiusercontent.com
So when someone opens the link, the DNS resolution exposes the unique hostname. The original bug reporter found dozens of these URLs in passive DNS logs.
> fiscal-review-b4a5ff.cf.metaaiusercontent.com
So when someone opens the link, the DNS resolution exposes the unique hostname. The original bug reporter found dozens of these URLs in passive DNS logs.