A âprivate information detector (PID)â is described that helps control the circulation of a user''s private information through a social network. It checks texts to be posted by the user on a social network and detects potential revelations of private information so that it warns the user or modifies the texts automatically. It can cope with a wide variety of expressions that might be revealing by using public information accessible through the Internet rather than a large knowledge base. Evaluation using about 7000 blog sentences showed that it has reasonably good performance in terms of true and false detection rates.
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