Re: Facebook simply would not exist today if not for Bletchley Park
LEO was a cool machine for its time, but IBM's tabulating machines (which were, in fact, computers) existed long before even Colossus or Turing's Bombe.
I'll be nice and not mention the Polish Bomba, much less Hollerith's tabulating machines that were used in the 1890 US Census.
That's not to take anything away from the British contributions to computing, far from it, I'm just trying to open a few rather blinkered eyes to the wider world ...
"If I have seen further it is by standing on the shoulders of Giants." —Isaac Newton, 1675