The big change to the way Facebook presents its user profiles and data is rolling out globally today. Timeline, the name and central theme of the visual overhaul, launched in New Zealand first about a week ago, and now Facebook's delivering it to the rest of the world as well. Cognizant of the potential for user revolt, Facebook is also giving everyone a seven-day review period, wherein you'll get to see exactly how your Timeline looks and what information it includes before any of your friends can cast an eye over it. You'll be able to promote some activities and events to feature more prominently or completely hide the ones that you'd rather people didn't know about.

To activate Timeline today, go to Facebook's Timeline demo site and click the "Get Timeline" button.