Lifebrowser's interactive timeline is reminiscent of a less polished version of Facebook's recently introduced Timeline feature. However, Horvitz's design precedes Facebook's and doesn't rely on a user to manually curate it. Photos, e-mails, and other documents and data points appear in chronological order, but Lifebrowser's timeline only shows those judged to be associated with "landmark" events by artificial intelligence algorithms. A user can slide a "volume control" to change how significant data has to be if it is to appear on the timeline. A search feature can pull up landmark events on a certain topic.