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 connect 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; and an analytics engine configured to receive indications of interactions with content by the content consumer computers and configured to receive out-of-band transaction data of content consumer parties associated with the content consumer computers; 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 producer computers.