12. The system of claim 9 , wherein the presenting the content objects based on the ranking of the content objects and the rotation value comprises presenting a first content object at a first rate based on the rotation value and presenting the remaining content objects at a second rate based on the rotation value.
12. The system of claim 9 , wherein the presenting the content objects based on the ranking of the content objects and the rotation value comprises presenting a first content object at a first rate based on the rotation value and presenting the remaining content objects at a second rate based on the rotation value. 13. The system of claim 12 , wherein the first rate equals to one minus the second rate.