PLEASE NOTE: Web Filter > Whitelist settings are global and they will impact everyone.
Option 1: If you block a Category of websites, you can then Whitelist a website(s) from within that Category.
Example – you block the Social Networking Category, but you still want to access Facebook. You would enter facebook.com into your whitelist.
Option 2: If you block a TLD you can Whitelist sites from within that TLD. See Whitelist only mode for details, but this is an advanced feature.