stores can take this information to a data broker and ask them to match up the name with the zip code in order to get the person s home address, and they can get other information, too. they might able to get e-mail address or phone number as well. chris hoofnagle, who teaches privacy law at the university of california berkeley, says researchers can use that information to target you for marketing campaigns, even share it with other retailers. he says they can gain information about your income, whether you ve gone through bankruptcy. experts say the practice is not unlike what political targeting groups use to find independent voters in certain zip codes, but those groups usually don t match names to addresses. retailers, experts say, often do. there are now lawsuits in some states over whether the practice is legal or should be. hoofnagle says retailers are usually playing within the rules when they go to data brokers to get added information about you. a worst-case scenario, he