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Re:Full quote of what Mark Zuckerberg actually said about HTML5 by Ryan_Shmotkin on Wednesday September 12, 2012 @12:06PM (#4511314)
And work on all browser for all people.

Or wait.. they don't for most

http://caniuse.com/websockets

Re:Full quote of what Mark Zuckerberg actually said about HTML5 by mikeryan on Wednesday September 12, 2012 @12:29PM (#4511452)
Pretty much every modern websockets Javascript library you use these days will provide fallback mechanisms to flash or long polling to provide the same features. Take a look at the supported browsers for Socket.io and its a much larger list then the one you've provided.

http://socket.io/#browser-support