1. A method comprising: receiving user input that identifies a topic for association with a neighborhood, the user input including votes from a community of users for the topic; creating, by use of a hardware processor, the neighborhood in association with the identified topic, the neighborhood defining a group of users that share an interest or behavior, the group of users including the community of users that voted for the topic; determining a related neighborhood based on a relatedness score that indicates a number of users among the group of users that participate in the related neighborhood; gathering neighborhood information by using the identified topic as a search term to search from sources including information related to the identified topic, the neighborhood information including data from the related neighborhood; automatically inviting users to join the created neighborhood; and causing display of a neighborhood visualization on a webpage accessible to the invited users.