The changes, which Facebook CEO Mark Zuckerberg described in a "60 Minutes" interview that aired last night, include an entire interface overhaul, redesigned profile sections and a handful of new fields.

All users will be converted to the newly redesigned profile pages by early January, Facebook says. To switch to the new profile pages immediately, go . Note that if you choose to make the switch, you will not be able to revert to the old design.

Also note that this redesign does not affect .

Here's a look at the new profile page and how to navigate the added features.