As it approaches its first stock offering next month, Snap, maker of the popular mobile messaging app Snapchat, is positioning itself as a camera company. “We feel like we’re really at the beginning of what cameras can do,” said Snap CEO Evan Spiegel. “Before, cameras were the best way to perfectly save or record something that you saw. They sort of helped augment memory — but now, you know, cameras augment the way that we talk.” Casting a company whose chief product is a messaging app as a camera company has raised some eyebrows.