1. A method of clustering news stories that are to be accessed over a computer network, comprising: obtaining a plurality of news articles via the computer network; clustering the news articles into a plurality of initial clusters; for only news articles, including any unclustered news articles, that are less than a predetermined age limit, determining whether to form one or more new clusters or assign the initial clusters in an incremental clustering process; and storing indications of the initial clusters and the one or more new clusters, if any, so as to be accessible for sending a portion of the news articles to users in a clustered format based on the initial clusters and the one or more new clusters, if any.