Well before twitter, we would go to places near refineries like pizza places, a deli, etc. We’d order an abnormal amount of food and leave a massive tip. When leaving we’d leave our business card.
Any rumor in the market about said refinery, we’d call that place to confirm.
The terminal guys were the best. We would just go early in the morning and bring dozens of donuts and good coffee. They would tell you anything. Who was storing what product, how much, who exited their lease......