Computer-based systems, methods, and articles of manufacture are disclosed. In a social network embodiment, information regarding a first user is obtained and formed into a first dataset. Conceptual spaces are selected for the first user, and the first user's location is determined in the spaces. Distances between the first user and other users and their datasets are computed in the selected conceptual spaces. Actions are taken based on the distances, such as including or excluding the other users from a friends list of the first user.