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https://jungyong.com/2012/05/25/sns%ec%8b%9c%eb%8c%80%ec%97%90-%eb%94%b1-%eb%a7%9e%eb%8a%94-%ec%a3%bc%ec%86%8c%eb%a1%9d-%ed%94%84%eb%a1%9c%ea%b7%b8%eb%9e%a8-cobook/
SNS시대에 딱 맞는 주소록 프로그램 cobook