2. The method of claim 1 , further comprising identifying, based on the user search activity, a set of follow-up queries for the query pair, each follow-up query in the set being a query that was received following receipt of the first query and the second query in at least one previous user search session, the set of follow-up queries including the third query.
2. The method of claim 1 , further comprising identifying, based on the user search activity, a set of follow-up queries for the query pair, each follow-up query in the set being a query that was received following receipt of the first query and the second query in at least one previous user search session, the set of follow-up queries including the third query. 5. The method of claim 2 , further comprising selecting, for providing to the user device, the third query from the set of follow-up queries based on a number of occurrences of the third query in the stored search log data.