A mobile device (620) provides an opinion system (600) for receiving opinions from a user and displaying results relating to the received opinion. Opinion user interface elements (621-622) receive input relating to the item of the opinion. The opinion is aggregated with other opinions received from other mobile devices and the result is provided to the user. A probability thereon may be applied to the aggregated opinions, and may be used to generate estimates of probability for a users propensity to an item based on the user's preferences.