Twitter is rolling out an algorithmically generated timeline that will show tweets out of order.<br />Starting Wednesday, tweets that Twitter thinks people most want to see will appear at the top of the timeline beginning with the most recent first, a departure from the reverse-chronological format that has been fundamental to the real-time service since its founding.<br />Unlike Facebook, the timeline won't be entirely ranked by relevance.<br />The tweets will show up after users open the app or web service and occasionally while they are using it.<br />After those tweets are shown, users will again see their timelines in reverse chronological order.<br />The new timeline is essentially an expansion of the "while you were away" feature introduced a year ago.<br />The new timeline will be turned on by default in coming weeks on Android, iOS and the Web, but users can turn it off.
