3. The method as recited in claim 1 , wherein each keyword associated with said particular online content source includes a respective keyword weight corresponding to said particular online content source, wherein said respective keyword weight indicates a strength of association of a corresponding keyword to said particular online content source.
3. The method as recited in claim 1 , wherein each keyword associated with said particular online content source includes a respective keyword weight corresponding to said particular online content source, wherein said respective keyword weight indicates a strength of association of a corresponding keyword to said particular online content source. 6. The method as recited in claim 3 , further comprising updating each keyword weight corresponding to said particular online content source according to a time-based decay model.