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Slack is a chat application, Yammer was a Facebook clone for businesses.

• nikolay 6y ago
  A chat application? :) No, Slack is an email replacement, just like Yammer was/is.
  • smcleod 6y ago
    Interesting you see it that way, across the companies and consultancies I've worked with it would only be a replacement for maybe 20% of emails, it's just replaced whatever chat systems were previously in place (IRC/Jabber/Skype etc...)
    • nikolay 6y ago
      That's even how Slack advertises their own service.