31. The non-transitory computer storage medium of claim 30 , wherein determining the confidence score associated with the topic comprises determining the confidence score based on a degree of correlation between the topic and actions of the particular user occurring on previous days at a time of day of the particular time.
30. The non-transitory computer storage medium of claim 23 , wherein the determining the confidence score comprises determining the confidence score based on a time of day or day of the week of the particular time.