1. A method, for displaying ad content with main content on a display device, wherein the display device is operated by a user, the method comprising: generating first characteristics for the display of the ad content; sending display information to a user device to display the ad content with the main content according to the first characteristics; accepting a user input signal associated with the user device to indicate an impact of the ad content upon a human user; generating second characteristics derived at least in part from the first characteristics and the indicated impact; and sending display information to a user device to display the ad content with the main content according to the second characteristics.