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Martha Lane Fox: Twitter engagement 'remarkable'

Twitter is expected to make its stock market debut later this week with a valuation of $14bn (£9bn), seven years after the company was born.

Speaking to the Today programme, Martha Lane Fox, co-founder of the travel website lastminute, said: "The engagement you have on Twitter as a user is quite remarkable."

She added: "Twitter is such an engaging and interactive tool but it's got to remain that and keep building on that."

First broadcast on the Today programme on Tuesday 5 November.