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PayPal's most effective technique by a dramatic margin was paying users $10 to get other users to sign up. It was an early example of using that sign-up referral payment approach at scale online.

https://www.businessinsider.com/peter-thiel-paypal-paid-cust...



I remember the good days when Uber paid £20 per sign up here in the UK.

I was on early and would just round people up at the end of a house party by shouting “who wants a free taxi home?!”.

I had free service for about a year.




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