The circle model powered suggestions and activities system provides a way to efficiently and effectively manage relationships. The circle model powered suggestions and activities system provides a way to model relationships for a user and assist the user with creating groupings of relevant constituents into context circles, provide suggested activities to members of the modeled relationships as well as facilitate the user with managing the user's relationships. The system analyzes public and private data, and tracks the user's interactions and the interactions of the constituents' of the user in order to generate suggested activities (including conversation starters) for the users and the constituents of the users. The system refines the semantic analysis and learning algorithms used to perform the analysis by analyzing the activities engaged in by the users and the constituents of the users related to suggested activities.