Yes they are - I've seen another version of that chart and it was annotated with... | Hacker News

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		jwomers on March 2, 2016 \| parent \| context \| favorite \| on: Slack will soon start testing voice and video chat Yes they are - I've seen another version of that chart and it was annotated with those dips being holidays.

fraserharris on March 2, 2016 [–]

Specifically, Christmas' of 2014 & 2015.

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