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Re:Slack raises $200M at $3.8B valuation for business messaging by _pmf_ on Friday April 01, 2016 @04:41PM (#11408423)
> so many high profile corporations

I think most of the perceived hype is generated by Slack itself and its SV valleys. I doubt that more than a handful of Fortune 500 companies even allow its usage.

Re:Slack raises $200M at $3.8B valuation for business messaging by krrrh on Saturday April 02, 2016 @04:58AM (#11410810)
Back in October 2014 it included at least some teams at MS, Apple, and big news organizations like NY Times, Wall Street Journal, etc. While it may not be 100% deployed, I'd bet that a lot of F500 companies have at least a few divisions that are all over it.

http://www.businessinsider.com/slack-flaw-lets-you-see-other...

Re:Slack raises $200M at $3.8B valuation for business messaging by reverius42 on Saturday April 02, 2016 @01:47AM (#11410419)
I've only heard anecdotally, but I wouldn't be surprised if many Fortune 500 companies' employees are using Slack without being "allowed".