Number of years it took for each product to gain 50 million users:
✈️ Airlines - 68 years
🔌 Electricity - 46 years
💳 Credit card - 28 years
📱 Cell phone - 12 years
👥 Facebook - 3 years
🐦 Twitter - 2 years
🤳 Pokémon Go- 19 days
https://t.co/7R8MhWu8y0 via @jasonlk