1. A method for enriching a directory service database by soliciting additional business information from businesses listed in the database, the method comprising the steps of: determining a URL of a listed business; classifying the listed business in a category by processing data located at the URL in a pre-trained classifier model; determining an email address of the listed business by mining the data located at the URL; and soliciting the listed business by delivering a message to the email address, the message being tailored to the category of the listed business.