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Wow, the most impressive thing here is the exponential growth: 2 million users in late 2009, 4 million mid 2010, 25 million now.



I imagine word of mouth has been a big factor for Dropbox. Who here has not at some point sung the holy gospel of Dropbox to someone else? Especially study groups.

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Amongst layman's or techies (coders, etc.) Most "normal" people don't seem to know what DropBox is outside of "introduction" via a "techie." Very anecdotal..it would be interesting to note paying vs free users, which could be (very lightly) related to layman / techie usage (VERY lightly).

Their affiliate program apparently has helped immensely with their growth. http://www.quora.com/How-effective-is-Dropboxs-referral-prog... "As of Apr 2010, the referral program with 2 sided incentive permanently increased signups by 60%

September 2008: 100,000 registered users January 2010 (15 mos later): 4,000,000 Mostly from word-of-mouth and viral: 35% of daily signups from referral program 20% from shared folders, other viral features Sustained 15-20%+ month-over-month growth since launch"

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Looks like O(n^2) growth to me. If we take month 0 as being in late 2009, then it looks like at month n they have about 19x^2/162-5x/6+2 million subscribers.

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This is true of any function if you evaluate it at only 3 points.

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That was the point.

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Sigh My point was that calling their growth exponential based on three points is silly, because with only three points you can fit a wide variety of curves.

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