Sergey Brin, interviewed in The Guardian:
Brin said he and co-founder Larry Page would not have been able to create Google if the internet was dominated by Facebook. "You have to play by their rules, which are really restrictive," he said. "The kind of environment that we developed Google in, the reason that we were able to develop a search engine, is the web was so open. Once you get too many rules, that will stifle innovation."
Rules? What rules? The fact that Facebook won't allow itself to be indexed is besides the point. There are plenty of companies that have succeeded in the 'era of Facebook' (if I can even call it that). Heard of a photo sharing app called Instagram? And once Facebook goes public who knows what their shareholders will ask of them in order to keep the revenue flowing.
I'll leave it up to Gruber to chew off the whole open web thing.