The company split itself in two, one half publishing the magazine and the other managing the mainframe database of content that powered the magazine (and eventually, on-screen listings.) Benefitting, perhaps, from the fact that the content of the magazine was highly structured (and repetitive) to begin with, the database part of the company set out to abstract the ongoing production of the listings from their printed form.
FORBES: With All Content Moving Mobile, Karen McGrane Writes, The API's The Thing