1. In a bowl, mix flour, baking soda, baking powder, and salt. In a small bowl, whisk eggs, buttermilk, and butter until blended. Stir egg mixture into flour mixture, then gently stir in blueberries.
2. Place a nonstick griddle or a 12-inch nonstick frying pan over medium heat (350°). When hot, coat griddle lightly with oil and adjust heat to maintain temperature. Spoon batter in 1/3-cup portions onto griddle and cook until pancakes are browned on the bottom and edges begin to look dry, about 2 minutes; turn with a wide spatula and brown other sides, 1 1/2 to 2 minutes longer. Coat pan with more oil as necessary to cook remaining pancakes.
3. Serve pancakes as cooked, or keep warm in a single layer on baking sheets in a 200° oven for up to 15 minutes.