You can easily add, setup and login into Facebook account on Windows Phone mobile device. Contents of logged in Facebook account can be seen in People hub, Pictures hub and the Me card. In case you are giving your phone to someone else, make sure you delete or remove logged in Facebook account details from your Windows Phone mobile.
Remove Facebook account from Windows Phone mobile
1. On Start, flick left to the App list.
2. Then tap Settings > Email & accounts.
3. Now tap and hold Facebook.
4. Tap Delete and then tap Delete again.
This will remove Facebook account details from Windows Phone. However, if you want to make changes to your Facebook account: then you can login into your account from Facebook.com website to make required changes from account settings at top right.