Facebook has never yet been a means of legal notice, because there isn’t any permanent record, and odds are he was blocking the harridan. Getting a reply back from him on Facebook would be the only way to demonstrate constructive notice actually happened. No reply, no proof.
Damages can still be assessed even if the child is left in its current situation (and no caviling about its, please).
If law is to underline moral duty and not just to be Calvinball to be played at people’s pleasure, then it should be respected.
Yes, there is. As much as there is with any medium. Letter can be burnt, voice mails can be erased, e-mails deleted. Even stone tablets can be broken.
and odds are he was blocking the harridan.
Why is she a harridan? And if he was "blocking her" how was she suppose to inform him?
The way you are setting it up aside from a formal summons there is no way she can "Prove" that he got notified without a response from him.
And how many guys respond when their casual sexual partner tells them that she is pregnant? Half maybe?
The law says she must inform him. She did. If they want to change the law so it defines more narrowly the way she must do so they can for the future but that would be expost facto in this case.
There is no denying that she did inform him, even he admits that.