You are hired as the data scientist by a company called Superstuff to lead a project to improve their understanding of their customers. You found out that you can buy information relating to your product (related posts, likes, etc.) from Facebook. However, the data is not in a format useful for analysis, so you decide to develop a Entity-Relationship model for the data, implement the database and then use SQL to do the analysis. You know that users can be friends with other users on Facebook. Users can write posts, share posts with their friends and add comments to existing posts. Users can also like posts or comments. Everything has a time and date associated with it. Identify entity types and relationship types and appropriate attributes, and draw an ER diagram. Do not forget to mark primary keys and add multiplicity to your diagram.