I’m very curious.

My off-the-cuff prediction is that casual Facebook users will see this as just one more piece of clutter and heavy Facebook users will embrace the flexibility. But just because it makes things messier or less consistent visually doesn’t necessarily mean its a bad design idea. It seems like a clever way to allow users to experience the page layout freedom they had on MySpace, but within the constraints of a rigid Facebook UI. Whether that’s what Facebook users want remains to be seen—Facebook has had more than its share of problems pushing unwanted features out to its user base.