different types of system wikipedia what is recommendation system? what is the difference between a recommender system and a trust system can recommendation systems be used for fraud what is the purpose of a recommender why would you use a recommender system difference between recommender and trust system why would you make a recommender system what is recommender system what is the difference between a recommender and a trust system what is a recommender and trust system what is the difference between a recommender and a trust system? different types of trust systems which type of system can be used to simulate a trust system what is the difference between a recommender and a trust system how to simulate recommender system how to simulate recommender system which type of system is based on a shared user matrix in which the ratings of an item are based on shared data types of collaborative filtering what is recommender