Cold start

you are in this shape if

• Each side joins only for the other side
• Value at N users is zero until N is large
• Growth spend leaks out through the empty-room experience

the moves

Single-player first

Give one side a tool worth using alone; the network arrives as a by-product of the tool's adoption.

Subsidise the hard side

Pay, guarantee or hand-hold the side that is scarcer until organic demand carries it.

Fake the room, then fill it

Seed supply or activity yourself — visibly alive beats honestly empty — and retire the scaffolding as real participants arrive.

Ride an existing graph

Launch inside a dense community or occasion that already has the relationships your network needs.

where it was solved

1. 1998Innocent DrinksBeveragesThree friends sold smoothies from a stall at a London jazz festival in the summer of 1998, with a sign asking festival-goers to throw their empty cup into a bin marked 'yes' or 'no' in answer to: should we quit our jobs to do this full-time? They counted bins, not opinions — a real behavioral vote in place of a survey.The 'yes' bin filled; only three cups landed in 'no'. All three resigned the next day. The company they launched, Innocent Drinks, grew into the UK's leading smoothie brand; Coca-Cola bought a roughly 20% stake for £30 million in 2009, raised it to 58% for about £65 million in 2010, and held over 90% by 2013 — sources vary on the exact 2009 percentage (10–20% per Wikipedia, 20% per trade press), so it's given as a range rather than a false-precise figure.
2. 1998Rabbi Yaacov Deyo / Aish HaTorahSocial / matchmakingIn 1998, brainstorming with friends in his living room, Deyo devised a structured event where men and women rotated through short, timed one-on-one conversations — about ten minutes each, a number he later said was simply practical for a busy coffeehouse — signaled to switch by a gragger, the noisemaker used at Purim, first run at a Beverly Hills coffee shop. Each attendee met many potential matches in one sitting with a built-in, non-awkward exit from any conversation that wasn't working.The format spread nationally within about a year as imitators outside the Jewish community that inspired it picked it up, and Deyo and collaborators trademarked the name 'SpeedDating'; the rotating-timed-round format is now common in dating markets worldwide.
3. 1999OpenTableRestaurantsSold restaurants a standalone reservation-book system that was worth having with zero diners online, then aggregated those restaurants for consumers.Became the canonical 'single-player tool first' marketplace case.
4. 1999Paulo CoelhoPublishingCoelho made no changes to his contract, his publisher, or his marketing budget — he simply gave away, in the language readers actually used, the exact thing his publisher was failing to sell them, betting that exposure would beat scarcity in an unmarketed territory.Russian sales rose to roughly 10,000 copies within a year, around 100,000 the year after, and by 2002 Coelho's total sales across titles passed a million copies; his Russian sales alone have since passed 10 million.
5. 1999PayPalFinancial technologyPayPal's team built an automated script that crawled live eBay auctions, emailed sellers directly asking them to accept PayPal, and then placed real bids on their listings insisting on paying with PayPal — winning some of those auctions and actually paying for the items, which were later given to charity. Sellers who received a real bid conditioned on accepting PayPal experienced concrete, immediate demand for the service, not a hypothetical pitch, and started offering PayPal as an option so as not to lose out on buyers.PayPal ended 1999 with fewer than 10,000 users, passed 100,000 by the end of January 2000, crossed 1 million within a few months after that, and reached roughly 5 million users by that summer — a trajectory PayPal's own early leadership and later industry retrospectives describe as driven primarily by an embeddable payment button for sellers and a $10-per-referral cash incentive, with the eBay auction-bidding bot serving as an early, narrower tactic that seeded real seller adoption before those larger mechanisms scaled.
6. 2005RedditSocial mediaThe founders posted under a swarm of fake usernames so the site looked inhabited from day one.Openly admitted years later; seeded the tone and culture the real community then adopted.
7. 2010American ExpressFinancial services / paymentsInstead of running ads about card benefits, American Express manufactured a new occasion on the calendar itself and gave merchants free marketing materials, social tools and card-linked offers to promote it locally — positioning American Express as the day's sponsor and infrastructure rather than as an advertiser competing for attention within someone else's already-owned day.The U.S. Senate unanimously passed a resolution supporting the day in 2011, all 50 states have officially participated, and consumer spending attributed to Small Business Saturday has been estimated at roughly $200 billion cumulatively since 2010 — a shopping occasion American Express originated now operating as a self-sustaining annual event promoted by the U.S. Small Business Administration independent of Amex's own marketing.
8. 2010Warby ParkerEyewear retail / e-commerceAt launch in February 2010, Warby Parker let customers pick any five frames on its website and receive them by mail for a free five-day home trial — no credit card required, no purchase obligation, and prepaid shipping label included for the return of whichever frames weren't kept.Home Try-On became the mechanism that let a startup with no stores sell glasses nationally from day one, driving word-of-mouth as customers photographed themselves in the mailed frames and posted them for friends to vote on, generating free social content the company never had to pay for. Warby Parker grew from that 2010 launch into a company valued in the billions, and Home Try-On remains a core acquisition channel even after the company later opened physical stores.
9. 2014WeChatPaymentsFor Chinese New Year 2014 (from January 17), WeChat introduced digital 红包 (hongbao) red envelopes: users sending or receiving lucky money through the app had to link a bank card to send funds or to withdraw money they'd received, folding card-binding into an existing gifting ritual between friends and family instead of asking for it directly.Tencent reported roughly 40 million virtual red envelopes worth about 400 million yuan exchanged in the initial 2014 campaign, driving millions of users to link bank cards to WeChat Pay within days. Growth compounded fast: red envelope volume reportedly went from around 16 million in 2014 to 1 billion in 2015 and 8 billion-plus by 2016. Alibaba's Jack Ma reportedly called the move a 'Pearl Harbor' moment for Alipay.
10. 2015PinduoduoE-commercePinduoduo's "砍一刀" (bargain-help) feature let a shopper drive a product's price toward zero for free — but only if friends each tapped a link and sliced off a piece of it. Rather than shrinking those slices by a fixed, predictable formula, the platform's cuts were randomized and time-limited, an all-or-nothing structure that a 2024 peer-reviewed analysis showed systematically out-recruits and out-profits any deterministic discount schedule, at the cost of shoppers who chase the last few cents forever without quite reaching them.Pinduoduo grew to over 300 million users by its July 2018 Nasdaq IPO (raising roughly $1.63 billion), concentrated heavily in the lower-tier Chinese cities Alibaba and JD.com's ad budgets barely reached. Contemporary estimates put its customer acquisition cost around ¥11 (about $1.64) per new user, versus roughly $46 for Alibaba's Taobao/Tmall and $35 for JD.com over the same period — built on friends recruiting friends rather than paid advertising.
11. 2015UberTransportUber recruited drivers in new and existing markets by guaranteeing minimum hourly earnings regardless of whether ride requests actually came in — most clearly documented in January 2015, when Uber cut rider fares in 48 US cities while simultaneously guaranteeing driver earnings so take-home pay wouldn't fall, keeping drivers logged in and available before demand alone could pay them.Uber's own January 2015 announcement and contemporary press coverage confirm the guarantee-plus-fare-cut mechanism across 48 cities; the same supply-first logic is described by former Uber growth staff as recurring through the company's earlier city-by-city launches from 2011 onward, though a precise, independently citable figure for any single 2013 city launch could not be confirmed live.

what breaks in transit

• Subsidies recruit mercenaries: supply bought with guarantees churns the day the guarantees stop.
• Seeding with fakes past the point of real trust (reviews, marketplaces with money at stake) crosses from scaffolding into fraud.
• Single-player tools can succeed as tools and never convert — the network step needs its own design, not just hope.

adjacent plates

• 09Stranger trust