Facebook honeybees recently painted a 42 foot wide QR code on the roof of the company's new headquarters in Menlo Park. Ta-da. Laughing Squid points out, "The QR code arose when CEO Mark Zuckerberg announced a company-wide "space hackathon" for the new campus." Oh, and the QR code will direct you to fbco.de."
And, there you have it.
[Laughing Squid, via Tech Crunch]