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![video-slack](https://tctechcrunch2011.files.wordpress.com/2016/12/video-slack.gif?w=680)
Slack, the workplace collaboration platform with 1.25 million paying users and 4 million overall, is adding one more key feature to its artillery of tools for people to communicate with each other, and it’s one that could help it pick up even more users away from other services like Skype and gmail: it’s adding video calling, the audiovisual complement to the audio chat…
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