The Sun -- the UK's most popular newspaper, with a daily circulation of 7 million -- switched allegiance from Labour to the Conservatives in 2009, a week before Brooks sent the text.

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According to the most recent ABC newspaper sales figures, the Belfast Telegraph remained Northern Ireland's biggest selling daily paper with a circulation of 53, 771 between July and December 2011, down 8.1% on the same period in 2010.

BBC: Job fears as Belfast Telegraph ends evening edition

The Philadelphia Inquirer, a former Knight-Ridder paper that was acquired last year by McClatchy and then sold to a local investor group, eked out an average daily circulation gain of 0.6% to 352, 592, a notable improvement from the 7.6% year-on-year decline it recorded during the previous six-month period.

FORBES: Magazine Article

Digital revenue has been growing at over 40% a year since 2010 while daily and Sunday circulation jumped about 33% and 90% respectively from September 2011 to September 2012.

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The biggest daily, El Universal, claims a circulation of just 153, 000 in a country of 100m people.

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The Wall Street Journal -- the second-most-popular newspaper for the Kindle after the New York Times -- has more than 15, 000 subscribers, according to a spokeswoman for the paper, compared to its paid circulation of more than two million daily.

WSJ: Publishers Nurture Rivals to Kindle

This 104, 000-circulation daily has lost 27, 000 subscribers in the past six years and was a drag on Knight-Ridders earnings growth.

FORBES: Encirclement

Average daily (Monday through Friday) circulation fell 2.1% from the same period a year earlier among 745 newspapers that submitted data, according to the Newspaper Association of America's analysis of figures released Monday by the Audit Bureau of Circulation.

FORBES: Magazine Article