A method implementable in at least one electronic device coupled to a network and a display device, includes receiving, over the network, a data set, receiving, from a user, a selection of a first topic, determining, based on the data set, a plurality of network sites hosting commentary of the first topic and an authority level of each site of the plurality, determining, based on the data set, an authority level of each site of the plurality, determining, based on the data set, a plurality of authors providing the commentary hosted by the plurality of network sites, determining, based on the data set, an authority level of each author of the plurality, and determining, based on the data set, a value characterizing an opinion of each author on the first topic.