4. The machine-implemented method of claim 1 , the method further comprising serving, for display on a device to a user, an item of sponsored content selected based on the item of sponsored content's score.
4. The machine-implemented method of claim 1 , the method further comprising serving, for display on a device to a user, an item of sponsored content selected based on the item of sponsored content's score. 5. The machine-implemented method of claim 4 , the method further comprising displaying the served item of sponsored content.