Apparatus for outputting content

There is described an apparatus for providing a recommendation to a first user, wherein the apparatus comprises: a processor arranged to: determine, at a first time, a first set of vectors for a plurality of users, including a vector associated with the first user; determine a set of clusters based on the first set of vectors; detect, at a second time, an event associated with the first user; determine an updated vector for the first user in dependence on the event; place the first user into a cluster of the set of clusters based on the updated vector; and determine a recommended item of content for the first user in dependence on the cluster; and a user interface and/or communication interface arranged to: output the recommendation and/or the recommended item to the first user.