Facebook sounds like a success in this case.
I find it hard to argue against something that worked, no matter how unlikely of a solution it was.
The girls are not in the drain system anymore and there was no door to door search nor was anybody charged with anything as a result of them disappearing.


There was a case mentioned on here a while ago about some young man who dialed their equivalent of 911 there and he died because they ignored him.

Edit.
I don't think that facebook should be a first choice and it certainly should not have been the only choice.

Edit 2
Of course it goes without saying that they should not have gone into the storm drains to start with, but they are kids and there was a way for them to get in.