To filter a contact:

1: Navigate to Contacts | People and search for the contact you want.

 You can also go to ADVANCED SEARCH which is in the tab menu in CONTACTS.
  Click on SEARCH ALL PEOPLE then click SEARCH.  This will search for all 
   contacts instead of searching for individual contacts. 

2: On the top right corner you can click on the image of binoculars which is a Filter.

3: You can type in a certain name, organization, etc... Click Search when finished.

4: If you want to look at all the users again simply click Reset.