4. The computer-readable storage medium of claim 1 wherein a feature of the discussion thread is an initial post of the discussion thread.
4. The computer-readable storage medium of claim 1 wherein a feature of the discussion thread is an initial post of the discussion thread. 5. The computer-readable storage medium of claim 4 wherein the feature that is the initial post contains terms of the body of the initial post but not the terms of the subject of the initial post.