Groups are the hardest feature of Facebook to replace, since they serve a wide range of purposes for different people. If you're looking to organize friends and family in one place, GroupMe is a great choice. The app helps create an organized group chat, where you can share photos and messages. If you're looking for a larger circle of people interested in the same topic, there's almost certainly a sub-group on Reddit to fill your needs. The forum site has active communities organized around everything from skincare to anime.
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A simple chat (slack style) it's enough. Just having the possibility to send messages either single user or team (#channel). But please don't forgive to give an useful appeal to mobile app (worst error of competitors is, have a good app but totally no mobile friendly!) i would expect to have a similar whatsapp or slack app for messaging within the slack mobile app!