1. A content distribution system comprising: a content subscription manager configured to control distribution of content provided by content producer computers to content consumer computers over a computer network; a content producer interface configured to content the content subscription manager to the content producer computers; a content consumer interface configured to connect the content subscription manager to the content consumer computers; an analytics engine configured to receive indications of interactions with content by the content consumer computers, each of the interactions being an interaction by an individual content consumer user through a content consumer computer, and the analytics engine configured to receive out-of-band transaction data of content consumer computers associated with the content consumer firms, the out-of-band transaction data being received in a form that associates financial transaction data of at least one individual content consumer user from a plurality of individual content consumer users associated with one of a plurality of content consumer firms with one individual content producer user from a plurality of individual content producer users associated with one of a plurality of content producer firms, each user of the plurality of individual content consumer users and the plurality of individual content producer users being inked to a respective firm by a firm identifier stored in a data structure that defines each user; the analytics engine further configured to generate correlations between the interactions with the content and the out-of-band transaction data and output the correlations to the content produce computers; and a transaction data interface configured to receive the out-of-band transaction data, the transaction data interface included a normalizer configured to normalize dissimilar formats of the out-of-band transaction data into a common interface for use by the analytics engine, out-of-band transaction data and a dissimilar format thereof being inked to each firm by a respective firm identifier.