The growth of apps such as WhatsApp and Viber tends to snowball

Going over the top: Who is going to profit from the rise of WhatsApp and Viber?

The apps are costing phone providers billions.

Psy's long-awaited follow-up to Gangnam Style, Gentleman, was released earlier this week

Psy of relief? 'Gangnam Style' star's 'Gentleman' scores 86 million YouTube hits in 72 hours

The pressure was on for Psy’s follow-up single after “Gangnam Style” became the most-watched video on YouTube with 1.5 billion hits.

The inside story: Kim Jong-Un’s former chef Kenji Fujimoto

North Korea: Why the media needs a sausage maker in Seoul

World View: Any source is a good source when desperate journalists can't dig up the most basic of facts

John Kerry meets China's top leaders to discuss North Korea

US Secretary of State John Kerry met China's top leaders today in a bid to persuade them to exert pressure on North Korea to scale back its belligerent rhetoric and, eventually, return to nuclear talks.

'PSY marks a new phenomenon - upbeat, relentlessly cheerful, cheesy and ironic'

Can he beat 'Gangnam Style'? Psy unveils new single 'Gentleman' with the refrain 'I am a party mafia!'

South Korean rapper Psy released his much-anticipated new single at midnight last night - and is hoping to repeat the success of its predecessor "Gangnam Style" which has made him the biggest star to emerge from the growing K-pop music scene.

China warns North Korea it will not tolerate 'troublemaking'

Warning from nation's only major ally come as speculation mounts that missile tests are imminent

'PSY marks a new phenomenon - upbeat, relentlessly cheerful, cheesy and ironic'

Brace yourself for Psy's second act - but will it live up to Gangnam Style?

It was impossible to escape his first single – but can the Korean rapper strike it big a second time?

In an effort to firm up support and loyalty Kim Jong-un has to keep visiting his military bases

Spy claims Kim Jong-un is struggling to control the North Korean army

A former North Korean spy has claimed Pyongyang’s threats of military action are a sign that Kim Jong-un is struggling to control his armed forces.

Millions of North Koreans have returned to collective farms to make fertiliser

North Korea's reservists 'called back to help with spring harvest'

The warning, announced on North Korean state television, is the latest salvo in weeks of sustained bellicosity that have raised the threat of conflict to its highest level in years. But on the ground the grave words were largely ignored – foreign businesses and schools were operating normally and consulates gave no indication they were taking the threat seriously.

South Koreans look north through binoculars near the demilitarized zone

'If war comes, we will fight because we have to': Life goes on near Korea's demilitarised zone

Tourists peer through telescopes from the southern side of the demilitarised zone (DMZ), trying to catch a glimpse of life across the line that divides North and South Korea.

Guard duty: A North Korean soldier keeps watch on South Korea last week from the truce village of Panmunjom

South Korea backtracks on nuclear test claim as tensions continue to rise across region

A government official said that Mr Ryoo had intended to say that North Korea has long been ready to conduct a nuclear test

Reports of Pyongyang's next missile test stokes tensions in South Korea

Military in the South is in ‘readiness’ amid fears of new weapons launch by the North this week

UK diplomats remain in place despite North Korea warning as Pyongyang moves missiles onto coast prompting fears of imminent attack

Beijing is believed to have sent private messages to Kim Jong-un urging caution

Office workers and shoppers throng the night-time streets of Seoul

The South Korean reaction: 'Pyongyang has been crying wolf for some time'

South Koreans, who have seen it all before, are carrying on as normal

North Korea moves missile 'with considerable range' to its east coast, as US troops in South are put on high alert amid rising tensions and threat of 'merciless' nuclear strike

Reports in the Japan suggested missile could be a KN-08, which is believed to be a long-range missile that if operational could hit the United States

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The drugs revolution starts now as MPs agree its high time for change

The drugs revolution starts now as MPs agree its high time for change

Commons debate highlights growing cross-party consensus on softening UK drugs legislation, unchanged for 43 years
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Gotcha! The camera is turned on tabloid editors

Hugh Grant says Richard Peppiatt's 'One Rogue Reporter' documentary will highlight issues raised by Leveson
Fall of the Berlin Wall: It was thanks to Mikhail Gorbachev that this symbol of division fell

Fall of the Berlin Wall

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Ouija boards, demon dolls, evil children and clowns are all classic tropes of horror, and this year’s Halloween releases feature them all. What makes them so frightening, decade after decade?
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Rose Rouse's safari in modern Britain

Rouse decided to walk and talk with as many different people as possible in her neighbourhood of Harlesden and her experiences have been published in a new book
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A head injury from a bicycle accident had the surprising effect of robbing Nell Frizzell of two of her senses

Matt Parker is proud of his square roots

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Paul Scholes column: Beating Manchester City is vital part of life at Manchester United. This is first major test for Luke Shaw, Angel Di Maria and Radamel Falcao – it’s not a game to lose

Paul Scholes column

Beating City is vital part of life at United. This is first major test for Shaw, Di Maria and Falcao – it’s not a game to lose
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Former Everton striker prepares his Orlando City side for the MLS - and having Kaka in the dressing room
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Manchester City will rise again but they need to change their attitude

Manuel Pellegrini’s side are too good to fail and derby allows them to start again, says Simon Hart
Isis in Syria: A general reveals the lack of communication with the US - and his country's awkward relationship with their allies-by-default

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‘A bit of a shock...’ Cambridge economist with Glasgow roots becomes Zambia’s acting President

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Guy Scott's predecessor, Michael Sata, died in a London hospital this week after a lengthy illness
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History catches up with Erich Honecker - the East German leader who praised the Iron Curtain and claimed it prevented a Third World War
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There are 90 million unused mobiles in the UK, which would be worth £7bn if we cashed them in, says David Crookes