Abstract
Users often share same text information for friends in different level groups on social networking services (SNSs). Moreover, it does not identify a person who has revealed the text. Some approaches overcome this problem by using anonymity text, but most methods for doing this has focused on databases. However, information about a user in SNSs is generally conveyed in sensitive phrases. Therefore, we developed the algorithm for automatically generalizing sensitive phrases. The generalized phrases are quantified by a precision metric to ensure that an appropriate level of privacy is used for each group. The algorithm then automatically creates synonyms for the generalized phrases for use in detecting disclosure. An application using the algorithm was implemented for controlling the posting of information on Facebook.
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