Abstract: A user can selectively customize what data is provided to a search engine to influence a degree of personalization of search results. Personalized search engine results can thereby be provided to one or more applications on a client device, such as a mobile phone. The data provided to the search engine can include any of a variety of user preferences stored on the client device (e.g., music, music ratings, search queries, search results selected, etc.), or other user information, such as current location or the location of the user when applications were downloaded. Social networking websites can also be used for supplying data to the search engine.