Thank you for that question. It's actually a very good question.
On this question of algorithms, what you see in your newsfeed, including advertising, depends on a number of what we call “signals”. Those signals include what you have liked before, what kinds of accounts you follow, what you have indicated your particular interests are, and any information that you have given us about your location, who you are and your demographic information. Those all act to prioritize, or not, particular information in your newsfeed. That will determine what you see when you open it up. It's personalized for each user.