Twitter has announced the company will be rolling out a new timeline feature that aims to keep you up-to-date with people you stalk online. Enabling this new algorithmic timeline feature will see the social blogging site attempt to select tweets that Twitter feels you most care about while you're away. Fortunately for now, this optional feature is disabled by default and will remain so unless you activate it, until Twitter begins flipping the switch for everyone.
With the feature enabled, the normal timeline will be available underneath the list of featured tweets, and both will continue to be filtered in reverse chronological order. Refreshing the service will then collapse the featured tweets for you to enjoy the traditional timeline view. Twitter will be launching the new feature "in the coming weeks", so if you want to take part and see what's changed, be sure to activate 'Show me the best Tweets first' in your settings.
Regardless to how you feel about change, remember that this is entirely optional and you'll be able to turn it off.