In one embodiment, a method includes accessing a log associated with a user. The log includes a number of entries that each indicate a geo-location of the user at a particular time of day of a particular day of a week. At least some of the data points being based on a geo-location determined and reported by a mobile computing device of the user without manual user input. The method also includes determining one or more geo-location centroids based on a distance between the respective geo-location centroid and each geo-location data point. Each geo-location centroid is representative of one or more of the geo-location data points obtained during the particular time of day of the particular day of a week.