1. A method of data processing comprising: receiving a user preference at a server computer system from a client computer over a network for enabling or disabling an erasure feature; storing an eraser identification cookie on the client computer system that represents the user preference for an erasure feature, wherein the eraser feature indicates whether a search query record is to be deleted from the server computer system, wherein the eraser identification cookie is user modifiable to allow or prevent the deletion of the search query record from the server computer system; storing an unfiltered results cookie, wherein the unfiltered results cookie identifies whether the user is capable of viewing unfiltered search results; receiving a search query from the client computer at the server computer system over the network; recording the search query at the server computer system to create a search query record; extracting search results from a data store based on the query; transmitting the search results from the server computer system to the client computer system, the search results depending on the unfiltered results cookie; determining at the server computer system whether the erasure feature is enabled or disabled; and automatically either deleting the search query record from the server computer system if the erasure feature is enabled, or not deleting the search query record on the server computer system if the search erasure feature is disabled.