Built upon the idea of user preferences, Communities is a feature which allows end-users to personalize their Squirro experience. Users can subscribe to topics of interest by following individual Communities. Items belonging to a community can then be displayed as headline items to the user, for example, in a Cognitive Search App.

Each community belongs to a community type. For example, in the image shown below, Food Products is a community type with communities like Bakery Products or Alcoholic Beverages. In Squirro, a community type is represented as a facet and the associated communities are mapped to the value of that facet. For example, the facet mapped to the community type Food Products is called food_products and the facet values are "Bakery Products" or "Alcoholic Beverages".