A system and method for discovering and displaying the compatibility between users of a search service is presented. The searching user registers with the search service and installs a web browser toolbar or component. The searching user browses web pages, and the toolbar searches each web page for identifying information. The toolbar then transmits the identifying information to a search server, which compares the identifying information with listed identifying information for other registered users. Upon finding one or more registered users corresponding to the identifying information, the search server then determines the compatibility between the searching user and each identified registered user, sending the compatibility reports back to the toolbar. The toolbar displays the compatibility reports to the searching user in the browser.