Whitehall officials say the aim is to deprive the Taleban of its virtual monopoly on propaganda using new media.
BBC security correspondent Frank Gardner said there was a growing realisation in Whitehall and Washington that the US-led coalition had been losing the propaganda war in Afghanistan to the Taleban.
The coalition's reputation was particularly damaged by the recent distribution of mobile phone footage showing the bodies of dozens of Afghan civilians killed in a US-led raid in August, our correspondent added.
On Sunday the UK's commander in Helmand said Britain should not expect a "decisive military victory" in Afghanistan.
Brig Mark Carleton-Smith said the aim of the mission was to ensure the Afghan army was able to manage the country on its own.
The number of UK soldiers killed on operations in Afghanistan since 2001 currently stands at 119.
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