14. An information processing system for recommending content in a social network, said information processing system comprising: a processor; and memory comprising computer-executable instructions that when executed by the processor perform a method, comprising: for a user: logging a set of actions; categorizing the set of actions into interest categories; weighting the interest categories to generate weighted interest categories, the weighting comprising: for a first interest category associated with a first subset of the set of actions: identifying one or more types of actions associated with the first interest category, respective types of actions associated with an action weight, the identifying comprising: identifying a first type of action corresponding to a search action, a subscribe action or a click action, a second type of action, and a third type of action, the first type of action, the second type of action and the third type of action associated with the first interest category, the first type of action having a first action weight, the second type of action having a second action weight, and the third type of action having a third action weight; and assigning a first weight to the first interest category based on the one or more types of actions associated with the first interest category and an action weight associated with each of the one or more types of actions; and calculating an interest social index for the user as a function of the weighted interest categories; for a second user within the social network of the user: logging a second set of actions; categorizing the second set of actions into a second set of interest categories; weighting the second set of interest categories to generate a second set of weighted interest categories; and calculating an interest social index for the second user as a function of the weighted interest categories; and calculating an influencer social index for the user based on the interest social index for the second user.
14. An information processing system for recommending content in a social network, said information processing system comprising: a processor; and memory comprising computer-executable instructions that when executed by the processor perform a method, comprising: for a user: logging a set of actions; categorizing the set of actions into interest categories; weighting the interest categories to generate weighted interest categories, the weighting comprising: for a first interest category associated with a first subset of the set of actions: identifying one or more types of actions associated with the first interest category, respective types of actions associated with an action weight, the identifying comprising: identifying a first type of action corresponding to a search action, a subscribe action or a click action, a second type of action, and a third type of action, the first type of action, the second type of action and the third type of action associated with the first interest category, the first type of action having a first action weight, the second type of action having a second action weight, and the third type of action having a third action weight; and assigning a first weight to the first interest category based on the one or more types of actions associated with the first interest category and an action weight associated with each of the one or more types of actions; and calculating an interest social index for the user as a function of the weighted interest categories; for a second user within the social network of the user: logging a second set of actions; categorizing the second set of actions into a second set of interest categories; weighting the second set of interest categories to generate a second set of weighted interest categories; and calculating an interest social index for the second user as a function of the weighted interest categories; and calculating an influencer social index for the user based on the interest social index for the second user. 17. The information processing system of claim 14 , the first type of action corresponding to the search action.