Sharepoint userprofile, sharepoint chat in shrepoint 2013 app using javascript object model

Hi             

I need some samples for SharePoint user profiles - in SharePoint apps

• Loading user properties with name/account name
• SharePoint 2013 chat
• Following people
• Some more Social network capabilities

I have referred some articles in msdn blogs , I could not get much help, I tried to extend code by referring

<script type="text/javascript" src="/_layouts/15/SP.UserProfiles.js">

</script>

……………….

   $('#aLoginUser').text('Hello ' + user.get_title());

   var object = new SP.UserProfiles.PeopleManager(context);

   var userProperties = object.getPropertiesFor(user.get_title());

   object.getUserProfilePropertyFor(user.get_loginName(), 'Title')

……………….

Work with user profiles in SharePoint 2013