To share content and/or a reaction related thereto between a plurality of different online service systems.SOLUTION: A content sharing support device comprises a content receiver, a content transmitter, a first reaction receiver and a first reaction transmitter. The content receiver receives content from an online service provision device. The content transmitter transmits the content to a first terminal connected to the content sharing support device. The first reaction receiver receives a first reaction related to the content from the first terminal. The first reaction transmitter transmits the first reaction to the online service provision device.SELECTED DRAWING: Figure 4
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