3. The method of claim 2 , wherein the certain steps further include: determining the second set of query terms by selecting, from one or more previously submitted sets of query terms, a particular set of query terms that has a proximity, relative to the first set of query terms, that is above a specified threshold; wherein the particular set of query terms differs from the first set of query terms.
2. The method of claim 1 , wherein the certain steps further include: for each vertical in the plurality of verticals, determining a number of previous searches that were performed, in that vertical, based on a second set of query terms; wherein ranking verticals in the plurality of verticals comprises ranking verticals in the plurality of verticals based at least in part on the numbers of previous searches that were performed, in that vertical, based on the second set of query terms.