A computer-implemented method and system are described for customizing content displayed to a user on a user device associated with the user. An example method may include receiving interaction data describing interactions by a user with one or more pages presented on a user device of the user, building a tag expression for the user based on the interaction data, the tag expression including a logical expression of tags and Boolean logic operators, and the tags being associated with page items. The method may also include generating a content page with a customized result customized to the user based on the tag expression.