1. A method comprising: receiving, via a computer network, data streams from a plurality of network servers, the data streams being associated with user activities performed across the plurality of network servers in relation to one or more computer-based services provided to users on the plurality of network servers; analyzing, by a computer, the received data streams, said analyzing including identifying a plurality of topics frequently occurring in the user activities, and a relevancy score for each topic of the plurality of topics, the relevancy score representing a relevance of each topic in relation to each of remaining topics of the plurality of topics; causing a computer display to present a radial arrangement of the plurality of topics, wherein the radial arrangement includes a plurality of nodes, each node representing one topic of the plurality of topics; wherein causing the computer display to present the radial arrangement of the plurality of topics includes: causing a center node to be presented at a center of the radial arrangement, wherein the center node represents a main topic including any of a selected topic submitted by a user of the computer or a default topic; and causing a first subset of nodes of the plurality of nodes to be presented at a radial distance from the center node, each of the first subset of nodes being presented as connected to the center node, wherein the first subset of nodes represent a first subset of topics, from the plurality of topics, having a first set of relevancy scores in relation to the main topic that exceed a first threshold.
3. The method of claim 1 , further comprising: in response to an input indicating a given topic by the user of the computer, updating the radial arrangement of the plurality of topics using the given topic as an updated main topic represented by the center node.