Google on Tuesday launched a new version of its personalized search that monitors previous searches to refine future results.

The more users search and build up a search history the better the results will become, said Marissa Mayer, who directs Google’s consumer Web products.

Consumers must have a Google account to use the service. If they have been using the previous version of personalized search they will automatically be switched to the new version. The service will only be available when the person is signed on to the Google account.

The search history feature, launched in April, lets people browse through a timeline of their past Google searches to see the level of activity on any given day, the number of times a user has visited a Web page and the last time it was viewed.

The previous test version of personalized search, launched in March 2004, customized searches only after users selected categories of interest.

Source: News.com