title: What to use: Community/Site or UserGroup for our requirement
body: <p>Hey I am a newbie to liferay.</p>
  
  <p>Anyway I want to provide a purchase order and compromise authorization system which should provide two types of user-groups based on who logs in.</p>
  
  <p>The two users are:</p>
  
  <ol>
  <li>User's related to PO(say accounts,sales department of a company)<br></li>
  <li>Various vendors to the company(say Vendor_A,Vendor_B,Vendor_C)<br></li>
  </ol>
  
  <p>On login:</p>
  
  <ol>
  <li>Accounts can view various vendors depending on vendor_id &amp; reference_PO_no<br></li>
  <li>A particular vendor on his login should see only his details &amp; not other vendors' detail.</li>
  </ol>
  
  <p>I am not sure how can I achieve this; either to create a UserGroup or Community. If UserGroup/Community how does Vendor_A <strong>not view</strong> Vendor_B's profile. Please help if anybody has a solution or done something of this in Liferay 6.1</p>
  
  <p>Software used:<br>
  Liferay portal 6.1.0 (bundled with tomcat7.0.23), MySql 5.1</p>