It is unfortunate they are both scary companies. They both know too much about their users, and their users connections.
Even if you don't have a Facebook account, there is probably still some evidence of you in their system. Unlike Facebook, it would be pretty hard to not use Google at all, but it's at least possible to use their services and remain unidentified.
Photos are over-rated, but tell that to the ~500 million people stalking each other on Facebook. Glass is an incredible vision into the future of computing, or a chilling vision of the future where there is no disconnecting from the web of surveillance.