Approaches for facilitating queries of a topic-based-source-specific search system are disclosed. In certain implementations, an input relating to a query may be received. Suggested ones of predefined sources and suggested ones of information items of the predefined sources may be determined based on the input. A set of suggestions including a group of suggestions relating to the suggested sources and a group of suggestions relating to the suggested information items may be provided for presentation on a user interface. In some implementations, metadata that indicates first, second, or other attributes relating to the predefined sources or the information items may be stored in association with the predefined sources or the information items. A second input relating to the query may be received responsive to providing the set of suggestions. A presentation of a comparison between the first attribute and the second attribute may be provided based on the second input.