That some functionality also works with gaming apps, news apps, and what Facebook is calling lifestyle apps (cooking, exercise, etc.).

While Zuckerberg mostly used the web version of Facebook for demos, he stressed that all the new functionality would be available for mobile phones as well.

This new capability will change the experience of using Facebook in a very fundamental way. It will have the more immediate, real-time feel of Twitter--when you merely “like” something, your friends might see that sometime later. But if you click on a stream to tune in, your friend will know that immediately.

The new “Timeline” historical function in Facebook answers a need for people who have been storing information at the Facebook “scrapbook” for a number of years and need to recall, review, or share some of it. “Timeline is the story of your life,” says Zuckerberg. "It contains all your stories, all your apps, and a new way to express who you are.”