A method, system, and computer program product for gap filling in a social network are provided. The method includes providing details of one or more current online users in a game in which users are scored for their input. A person is selected from candidates for whom additional information is required in a social network, including: weighting candidates who have a strong relationship with a current online user in the game; and weighting candidates for whom there is little existing data in the social network. The method includes identifying the selected person to a current online user; receiving information input by a current online user relating to the selected person; and scoring the information input by a current online user.