It's great to see how such a fundamental change in how browsers and servers communicate can get rolled out so quickly! I would have guessed that this sort of thing would require many more years of effort than it did.

The author of the post, however, does seem to misunderstand SPDY's server push feature. He states that Facebook requires a substitute for long-polling for low-latency message delivery, and seems to think SPDY provides this. Unless I'm mistaken and there's some Javascript API available, server push is merely for cache-priming and reducing latency of requested objects alongside a regular pageload (eg, push the CSS and images along with an html page).