From the WhatsApp's acqusition to closing down Facebook Messages, I think his talk back in 2010 makes sense.
"We don't think modern messaging system will be email," he noted, saying that he believes seven characteristics that we will come to define "next generation" messaging: seamless, informal, immediate, personal, simple, minimal, and short.
Why does every definition of new future super cool messaging system imply "immediate". I quite don't like that. Not everything needs to be a chat and immediate.
Why!? I compose long emails for a reason! I can't get my point across in short messages sometimes! I might be explaining a long and complex story with some backstory!
"We don't think modern messaging system will be email," he noted, saying that he believes seven characteristics that we will come to define "next generation" messaging: seamless, informal, immediate, personal, simple, minimal, and short.
(http://www.huffingtonpost.com/2010/11/15/facebook-email-addr...)
He hasn't given up his dream of becoming the leader in mobile, seamless messaging/communication.