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This is exactly what mark zuckerberg did. [sarcasm]

IMHO, you invalidate an idea after you implement it and see the user's reactions. Before then, you cannot know if it will succeed or not.

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I named fb as a counterexample. I think you can definitely succeed without validating or invalidating your idea first, but it's a much bigger risk, and you are building a very specific kind of company. How many facebooks and twitters are there in the world?

Which is great if you can implement the idea in a weekend. Much harder if it'll take 2 years to build before you can see if the time was worth spending.

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