:Pinterest's fourth-quarter revenue forecast failed to impress investors looking for a boost from the upcoming holiday shopping season, at a time when bigger online ad sellers largely outperformed, sending its shares down 11 per cent in extended trading on Thursday. The San Francisco, California-based company also announced a new stock buyback program of up to $2 billion and canceled the September 2023 program under which $500 million were left for repurchase. Pinterest's results follow

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