9. The computer implemented method of claim 8 , wherein selecting a topic descriptor from the set of potential topic descriptors comprises: scoring each potential topic descriptor of the set of potential topic descriptors; and selecting the highest scoring potential topic descriptor as the selected topic descriptor.
9. The computer implemented method of claim 8 , wherein selecting a topic descriptor from the set of potential topic descriptors comprises: scoring each potential topic descriptor of the set of potential topic descriptors; and selecting the highest scoring potential topic descriptor as the selected topic descriptor. 10. The computer implemented method of claim 9 , wherein scoring each potential topic descriptor of the set of potential topic descriptors comprises, for each potential topic descriptor that was identified as a search query that resulted in search results that included a corresponding link, further scoring the potential topic descriptor according to the frequency of the search query in the search logs.