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US messaging upstart Slack now faces giant tech rivals

Slack is the product of Mr Butterfield's second failed attempt to make a video game. His first, Game Neverending, had a photo-sharing feature that became more popular than the game. It became Flickr, which was sold to Yahoo for US$25 million in 2005.

San Francisco

SLACK is the classic Silicon Valley accidental success. Born three years ago, with roots in a failed video game, the messaging software is now used by five million people.

The company behind it, Slack Technologies, found success by combining something that Silicon...

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