English英语译成Chinese汉语 技术/工程设计 IT（信息技术） Robot

Third-party data is collected by outside companies. Companies like Acxiom and Experian acquire and aggregate data on customers from many different places, and they analyze and index it until they have complete profiles on everybody. I think Acxiom tracks almost 4,000 propensities. You can ask, for example, for lists of people who are 150 percent {over-indexed} on luxury automobiles and 200 percent over-indexed on craft beer, and geofence them.