Twitter executives celebrate the company's listing but the stock is down 42% this year
Performance in2014: Since the start of the year its share price has fallen by 42% to $36.73
See all 12of 2014's worst investments here
What have we learned?
Who are the losers?
Who are the winners?
What happens next?
What have we learned?
See all 12of 2014's worst investments here
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