2. The system according to claim 1 , including a database update unit coupled to the database and responsive to successive manual selections of displayed media objects for adjusting the respective ranks of matching media objects and updating the database accordingly.
2. The system according to claim 1 , including a database update unit coupled to the database and responsive to successive manual selections of displayed media objects for adjusting the respective ranks of matching media objects and updating the database accordingly. 3. The system according to claim 2 , wherein the database update unit is responsive to repeated manual selection of objects of a specified type, for increasing the rank of all media objects of said specified type in the database.