The present invention relates to an analyzer, a system, a method, and a computer-readable medium for defining a preferred group of users, wherein the group is defined in the following way. The analyzer receives data from a data network node, which may be e.g. a (plurality of) data-base(s). After receiving the data, there is determined a social network of the users and a set of parameters for each user. The set of parameters may comprise e.g. an innovator score, a repeat user score and a social influence score. After the above de- termination, there is determined the preferred group of users based on the social network and the set of parameters. The information (or indication) of the preferred group of users may be utilized in various marketing activities (e.g. product launch or churn management).
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