Number of years it took each product to gain 50 million users:
Airlines: 68 years
Cars: 62 years
Telephones: 50 years
Credit Card: 28 years
TV: 22 years
Computers: 14 years
Internet: 7 years
PayPal: 5 years
YouTube: 4 years
Facebook: 3 years
Twitter: 2 years
WeChat:… https://t.co/XIrSdJH671
Post #1555
312