Design an Instagram Ranking Model

Focus on the key factors that influence content ranking on Instagram, such as user engagement, recency of posts, and the relationship between users. Consider how to weigh these factors to optimize for user satisfaction and retention. Discuss the data sources you would use, such as likes, comments, shares, and time spent on posts, and how you would implement machine learning algorithms to refine the model over time. Be prepared to address potential biases in the model and how you would ensure fairness in content visibility across diverse user demographics.