Big Data brokers collect and sell information to marketers on everything from your marital status, whether you might be pregnant or have a newborn, have cancer, are trying to lose weight, are gay or straight. There were 253 of them as of this past March, according to a directory compiled by the Privacy Rights Clearinghouse. One major broker, Acxiom, has been very much in the news over the past month for allowing consumers to view a portion of the data it collects on them through a new portal.”]