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Facebook made Timeline available for testing on September 22, 2011 (see How to Enable The New Facebook Timeline"). The response to the new layout has been mixed, with Mashable editor Lance Ulanoff penning an article entitled "Facebook Timeline, Zuckerberg`s Biggest Gamble Yet". Charlie White, meanwhile, praised the changes in an article titled: Why I Love the New Facebook Timeline".
Source link: http://mashable.com/follow/topics/facebook-timeline/