A user is allowed to include of social category indicators in a user profile header of an on-line posting. In response to answers to questions presented by a social category application executing on a user terminal device or a system, characteristics of a user's interests or personal traits may be determined. Using the characteristics, social category indicators are generated that include a symbol for presentation with a user profile header in a message board of a webpage. The social category application may interact with the provider website/application to substitute the social category user profile header for a standard user profile header of the webpage, so that the indicators appear on the message board(s) as part of the user's postings. The indicators in the social category user profile header allows user to more effectively identify persons with similar interests and backgrounds without engaging in lengthy text exchanges with other persons.