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How the growth built
Every user gets five invites. The 200 testers brought in five more people the next day, then five more the day after, so the count went from 205 to 210, which looked like a trickle. Then the daily rate started to climb to 3 percent and 4 percent. Once the user base reached a couple thousand, some people began posting their own use cases online, and the rate moved up through 6, 7, 8, and 9 percent to about 10 or 11 percent today.
What drives it
Nothing drives this except the invites themselves. Each day roughly 10 percent of users decide to give up one of their five invites to someone else, and that has held for weeks.
Invites as currency
The invites have turned into a social currency. People email the company asking for one because they aren't sure they made it onto a friend's list of five, while others brag about the invites they're holding back. Some invites have been listed on eBay for around 300 dollars.
Why do invite-only launches create demand?
Limiting access makes membership feel like something earned rather than something anyone can have. Gmail launched in April 2004 by invitation only, and invitations were soon being resold on eBay. Clubhouse used the same approach in 2020, and its early invitations were also offered for sale online. Google did not open Gmail to everyone until February 2007.
Why does exponential growth look slow at first?
When the base is small, even a steady percentage adds only a handful of people a day, so the early curve looks almost flat. The same percentage applied to a larger base adds more each day, and that compounding is the whole shape of an exponential. The effect is easy to miss on a chart until the curve bends upward. Epidemiologists use the same math to describe the early days of an outbreak, when daily case counts look small.
How do referral programs fuel growth?
A referral program turns each customer into a distribution channel, so growth depends on how many new people each existing user brings in. Dropbox offered extra free storage to people who invited friends. Its chief executive, Drew Houston, has said that the program raised signups by 60 percent.
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