This question primarily revolves around data or statistics and typically evaluates your awareness of current technological trends along with your understanding of metrics or tracking, particularly in the realm of social media. When responding, be truthful about your knowledge and any gaps in it. It's preferable to be candid rather than make inaccurate guesses. If you aren't certain of the precise figure, you can still showcase your analytical thinking and general comprehension of Instagram's popularity by offering an estimate.