Back in September, we covered and discussed the new features Facebook planned to roll out, as announced at the F8 event in San Francisco. One of the most talked about features was Timeline, a totally revamped look for Facebook profiles.

Timeline is a user interface revision of Facebook's profile page. Its aim is to let users easily access older content they've shared or posted. This is done by streamlining the profile page into a layout that's broken up by year. Simply click on the year you want to access, and you'll be able to view it.

To begin with, Timeline was only available to preview by developers. Now it's going live for everyone. Facebook users currently have the ability to opt in to the change for the next week. Facebook is calling this their 7-day review period. This means you're allowed to make changes and tweak your profile, without people on your friends list being able to see it just yet. You can choose to publish your new profile whenever you like, but after the week is out Timeline will automatically become visible to your friends.

The new profile can also be viewed currently in the official Facebook app for Android and via mobile sites.

In addition, there's also greater integration with apps on the new Timeline profile. A great example of this is how listening to music in Spotify shows up on your new profile.

Recent Spotify music will show up just like shared links and status updates, within the main interface of your profile. Mousing over a specific song will give you more information about the track, as well as allow you to comment on it, like it or even share it with other friends.

As with all changes Facebook implements, this one will take some getting used to for many users. The 7-day review period will help ease users into the new features though, and make it possible to customize your profile to perfection before the big reveal to friends and family.