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The most dangerous moment for any company is when it starts believing its own success is inevitable. That's when disruption walks through the door.
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We don't need to build everything ourselves. We just need to build the platform and invest in the best people who can build everything else.
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User experience is everything. If the product is good enough, users will come. If it isn't, no amount of marketing will save it.
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In China, if you don't cannibalize your own product, someone else will. WeChat was designed to kill QQ before a competitor could.
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I prefer sending emails at 3 AM about product bugs to giving keynote speeches. The product is the speech.