Amazon.com Inc. is buying video service Twitch Interactive Inc. for more than $1 billion in its biggest acquisition ever, adding an online gathering place for video gamers, people with knowledge of the plans said.

Amazon moved in to buy Twitch after the startup’s deal with Google Inc. fell through, said the people, who asked not to be be identified because the talks are private. An announcement for an acquisition for about $1.1 billion could be made as soon today, one person said.

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