You all must miss the user's search feature for your website. User search can be used to list out users as per the conditions given by user.
JoomlaXi component XIUS (user search) meets this requirement. XIUS is a combination of Component, Plugin and Module. By using this component, you can create information in back-end on the basic of created information, users can make their search possible and these search result will be shown in front end. You can display user lists through XiUS UserList Module and Users have the option to save those lists as CSV file or simple list. Instead of these features, User can send email or private messages to searched users and many other features.