A social network system includes one or more participant terminals operable to act as a client on a social network and a computer operable to act as a server on the social network and to communicate with each of the participant terminals over the social network. The computer includes: a memory configured to store a set of instructions; and a processor configured to execute the set of instructions. The set of instructions cause the processor to display categories into which content may be categorized, and to accept categorization of a user's own postings and of postings of other participants of the system. Displayed categories and icons for implementing categorization may appear on the initial page of the user. The number of items categorized in each category may be displayed to generate a profile summarizing the interests of the user having the user page.