A game service platform server for providing a game service platform includes: a game association module to allow a first user device of a first user to access each of a plurality of games provided by the game service platform server; and a friend management module to: receive a service request from the first user device to access a game, associated with account information of a social network service (SNS) subscribed by the first user; inquire an acquaintance list of the first user to determine whether SNS acquaintances of the first user have joined the game; register, automatically, an SNS acquaintance as a game friend of the first user in response to a determination that the SNS acquaintance has joined the game; and transmit, to the first user device, game group information including results of the determination for each of the SNS acquaintances of the user.
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