Buffer just turned 15 years old! And we're fortunate to be closing out our best year in the past 7. We have 69,000 customers, a $23M annual run rate, and achieve over $2M in profit in 2025. To mark 15 years of Buffer, here are 15 of the key lessons I've leaned first hand as a founder CEO. These may not all apply for you, but I hope some are useful and they at least get you thinking: 1. Survival is a competitive advantage. Setting up the ownership structure to play an infinite game is both a…