• by Mark Walsh  @markfwal, December 15, 2011

Facebook Thursday began the formal rollout of Timeline, three months after announcing the feature replacing the old profile page that lets users highlight milestones in their life and post other status updates.

Users will have seven days to review everything that appears in their timeline before anyone else can see it. It will go live automatically after seven days if someone to decides to wait.

Brands can take advantage of the new feature by creating applications that allow users to say their “watching,” “listening,” or reading” something that can be included as a default action appearing in Timeline. They can also create custom apps for other actives like “running” or “cooking” that show up in Timeline when someone uses that app.