Systems and methods for constructing a query result set are described. In one described method, a display processor or query system refreshes a first result set comprising a first plurality of article identifiers. The display processor or query system receives or creates a second result set comprising a second plurality of article identifiers. The display processor then creates a third result set based at least in part on the first result set and the second result set. The display processor may create the third result set by modifying the first result set based at least in part on the second plurality of article identifiers or by modifying the second result set based at least in part on the first plurality of article identifiers.