In a networked system, a method and apparatus for measuring advertising effectiveness involves broadcasting an advertisement at a broadcast time, monitoring at least one social network or other online forum following the broadcast time, filtering social network traffic to identify messages, search engine queries to identify queries, or other traffic entries, that appear to be responsive to the broadcast advertisement, determining a time of initiation for at least a plurality of entries that appear to be responsive to the broadcast advertisement, and determining at least one demographic for at least the plurality of the entries that appear to be responsive to the broadcast advertisement.