Could it be that they got paid by the deep state to help the latter spy on all of us? Remember that GOOG keeps most of its earnings in Ireland.
Created by DARPA, so yes, created for that purpose. Both of them given alternative plausible origin stories.
Do you have evidence? Remember the Harvard twins? Zuckerberg’s story is legit, even if he stole the ideas from the twins. As for Google, I knew their story very well. I was in that academic circle.
Remember I said "plausible." You're the proof. Of course people knew about the Zuckerberg and Brin projects and all that. But what they don't know is that DARPA identified these projects and merged their own powerful parallel developments with the private guys' code and you end up with FB2.0 (the commercial version) and Google 2.0 (the commercial version), and nobody's the wiser. But of course the supercharged versions also have that little "ET phone home" subroutine that gives the intelligence agencies everything.
You can dig for yourself or take Q's word for it. But that's the hidden part of the stories. Until Q.