Keybase has a Teams feature so it's built more towards your use-case. I use it to trade Stellar (XLM), file storage/management, and sharing/proving all of my platform identities. I haven't had a chance to get too social on it yet so I can't comment on the chatting experience, but overall it's a neat platform. It also has a command-line interface.

If you end up signing-up, follow me @ https://keybase.io/jbales