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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.

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"

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.

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

That was the point.

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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