12. A non-transitory computer readable storage medium, tangibly embodying a program of instructions executable by the computer for identifying questionable content in a social network website, the social network website having therein content that has been posted in the social network website by a first user, the questionable content being identified in response to the first user performing steps of becoming a friend in the social network website to a second user, the program of instructions, when executing, performing the following steps: receiving the content that has been posted in the social network website by the first user; receiving an identification of the second user; receiving private information associated with the second user from a source of private information about the second user; receiving public information associated with the second user from a source of public information about the second user; identifying, based upon the received content that has been posted in the social network website by the first user, the received private information and the received public information, at least a part of the content that has been posted in the social network website by the first user as the questionable content; and indicating, to the first user, the identified questionable content.
12. A non-transitory computer readable storage medium, tangibly embodying a program of instructions executable by the computer for identifying questionable content in a social network website, the social network website having therein content that has been posted in the social network website by a first user, the questionable content being identified in response to the first user performing steps of becoming a friend in the social network website to a second user, the program of instructions, when executing, performing the following steps: receiving the content that has been posted in the social network website by the first user; receiving an identification of the second user; receiving private information associated with the second user from a source of private information about the second user; receiving public information associated with the second user from a source of public information about the second user; identifying, based upon the received content that has been posted in the social network website by the first user, the received private information and the received public information, at least a part of the content that has been posted in the social network website by the first user as the questionable content; and indicating, to the first user, the identified questionable content. 13. The non-transitory computer readable storage medium of claim 12 , wherein the steps of becoming a friend in the social network website to a second user comprise the first user making a friendship request via the social network website to the second user.