An argument is raging in the blogosphere and the Twittersphere about whether there are enough accepted punctuation marks to fit the new world of communication.

The internet and the arrival of email, text messages and Twitter have thrown up hundreds of new ways of communicating, such as using smiley faces, and new abbreviations.

Tim Harford, presenter of Radio 4's More or Less programme, and John Richards chairman of the Apostrophe Protection Society, discuss the punctuation revolution and how it is changing how we communicate.

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