1. A method for building a user interest profile, comprising: identifying features of each of a plurality of articles; for a given user, logging views of one or more of the plurality of articles; for each view, measuring a corresponding dwell time for the view by the given user; applying a weight to each view based on the corresponding measured dwell time; determining user interest scores for features of the one or more of the plurality of articles based on the weighted views; generating a user interest profile for the given user based on the user interest scores; wherein the method is executed by at least one processor.