4. The method of claim 1 , wherein the user's interests are determined based on user's browsing history over a predetermined recent period of time.
1. A method for assessing user interest scores of users of mobile network, the method comprising: for each of a plurality of users, determining initial interest scores corresponding to user's interests and interest scores of friends of the user for the user's interests, based on browsing information, and assessing user's interest scores based on the initial interest scores, the interest scores of the friends and friends' influence, wherein the friends' influence is inferred based at least on comparing browsing patterns of the user and the friends of the user, respectively; and outputting a list including a subset of the users selected based on the user's interest scores, wherein a friend's influence is positive if user's recent browsing pattern is similar to friend's recent browsing pattern, if the user's recent browsing pattern is not similar to the friend's recent browsing pattern, a friend's influence for a specific interest is negative if the user's initial score for the specific interest is larger than friend's initial score for the specific interest, and is positive otherwise, and the assessing of the user's interest scores includes: calculating an error factor that is equal to one divided by a number of the friends taken into consideration; for each interest and each friend, calculating a friend's contribution to a user's interest score for the interest as follows: if the user's recent browsing pattern is similar to the friend's recent browsing pattern, the friend's contribution is an average between a friend's interest score for the interest and the error factor; if the user's recent browsing pattern is not similar to the friend's recent browsing pattern, the friend's contribution is (A) equal to the error factor if the friend's interest score for the interest is larger than the initial interest score for the interest, and (B) equal to negative of the error factor otherwise; and for each interest calculating the user's interest score as a sum of the initial interest score for the interest and, for all the friends considered, the friend contribution to the user's interest score for the interest.