At Facebook's F8 developers Conference in San Francisco last September, CEO Mark Zuckerberg introduced the site's new page motif, Timeline. F8 has played host to most of Facebook's biggest announcements--new profiles, the Like button for websites, Graph API--but this one had the usually unflappable Zuckerberg looking a little giddy. "We're more than just what we've done recently," he told his listeners, and he laughed as he scrolled through his own Timeline to show the audience a few of his baby photos.
Timeline, which is being introduced to all Facebook users over the next few weeks, is a complete rewiring of the...