Collecting and classifying user information into dynamically-updated user profiles

Systems and methods for collecting, classifying and organizing user information into a dynamically-updated user profile are provided. Information pertaining to a user is obtained from one or more data sources, and the information is then classified into specific categories using field mapping and other techniques, after which it is organized into a user profile and securely stored in a database. The user profile is dynamically-updated by automatically detecting and storing updates to the information in the user profile based on user interactions, communications and other online or electronic activities. Information is instantaneously collected from user-completed electronic form input fields which is mapped back to the user profile. The user profile is a single, comprehensive source of user information that is securely stored and available to the user in any location and for any purpose, such as automatically and instantaneously populating fields of an electronic document, form or web-based application.