And in those rare cases, businesses thrive without organized marketing.

As I write this, I'm reviewing a startup that looks to me as if it could be one of those product-driven successes that thrive without much focus on marketing planning.

Yesterday, the founders showed me their video-rich and design-rich web building platform.

Then, the user excitement will show up in Twitter and Facebook and Google+.

So as investors, do we write them off for lack of a marketing plan?

In interviews, founder Mark Zuckerberg talks about programming; he's all about the product and very little about marketing.

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