After adding a new account to sync with your phone, you'll be asked whether to add contacts from that account the next time you open the People app. You can choose to only display contacts from particular account types (for example, Google contacts or Facebook contacts).
From the Home screen, tap
On the All tab, press , then tap View.
Select the types of contacts you want to show in your contacts list.
You can also choose how you want to display and sort your contacts.