The most valuable data is not social data, not what you ate for lunch, not even debt-to-income ratio, even though you know that’s fairly predictive, but your own data because every dataset that you’re looking at internally describes your own process, including your bugs, including your delays, including what changed, including the merchant base that you sign and the merchant base that churned. All those changes to your system are encoded in your own logs and building models from your own data is the only way to build a really successful system.
Find source| 0 | source | Max Levchin |