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I hate Yammer but some salespeople in a previous company "lived" in it. I always thought of this obsession with having a company-wide social network as horrible and creepy. Teams or Slack are just about the most I can tolerate: flexible working groups. Anything beyond that is oversharing. I honestly don't want to hear about the party you had after this or that big win, particularly when I know how much those drinks cost compared to my non-rising salary.

Then again, I don't like anything that resembles instagram culture, so I'm probably in a minority.

I'm no SharePoint fan, but Yammer is sooooooo superior to anything from google partly because of the deep integration with SharePoint (and AD).

Google already has Chat, Mail, and Currents (and Docs, and more), so, yes.