Interesting to note: Google web search is not the least bit viral. Nor is Firefox. Nor it Kayak.
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Great checklist of things to ask when sorting through a new idea.
I always find the time I spend right after I come up with a ‘killer’ idea to be thrilling; planning out the different stages of the product, who your first users will be, what kind of growth you’ll feel - you can practically taste the money already. I’ll be sure to have this list on hand next time.