20. The method of claim 15 , wherein each label of the corresponding first set of labels is sized according to a number of occurrence of a corresponding topic associated with the label occurring within the user activities.
15. A method comprising: providing, on a computer display, a user interface including a radial arrangement of a plurality of topics extracted from data streams associated with user activities occurring across a plurality of network servers, the radial arrangement including: a first topic of the plurality of topics represented as a center node at a center of the radial arrangement, the first topic being a main topic of the radial arrangement; a first subset of topics represented as a first subset of nodes arranged at a radial distance from the center node, wherein the first subset of topics includes one or more topics from the plurality of topics having a relevancy score in relation to the first topic that exceeds a first threshold; and for at least one topic of the first subset of topics, a second subset of topics represented as a second subset of nodes, the second subset of nodes arranged at a second radial distance outward from a respective node that corresponds to said at least one topic; wherein the first subset of topics are accompanied a corresponding first set of labels displayed proximate to the first subset of nodes representing the first subset of topics; and in response to a selection by a user of a first label from the corresponding first set of labels, updating the radial arrangement using a second topic associated with the selected first label as the main topic represented by the center node of the radial arrangement.