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n00b1 - 7:40 am on Oct 27, 2012 (gmt 0)
Some interesting discussion regarding dwell time and bounce backs as a possible signal for Google algorthmically - 49:20 onwards on John Mueller's 'Webmaster office-hours, 22nd October, 2012'. This video can be found on on YouTube or his G+ profile. He basically explains that these aren't signals Google could really use for its algorithms and that it isn't a good signal of 'bad quality' if a user bounces back after viewing a page and is often quite normal.