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For file based collaboration and team communication you can also explore Oogwave.com. Simple tool allowing you to work in private groups, with unlimited storage, versions and file comments.
Moreover, with folders permission , you can restrict your files controls. Best part, free for 20 users. Only requirement - company email address. Not applicable for generic emails.
If you have question, drop me an email at email@example.com.
Sales and Engagement, Oogwave
New Delhi, India.
Could I suggest that Clinked is what you're looking for?
As well as sharing, commenting on documents, you get 1TB file storage as well as Desktop SmartSync software which syncs your local folders with the cloud and vice versa, In addition to document management and sharing features, Clinked also features wiki-style online editable pages, task management, events calendar, schedule and discussions section. It also has @mentioning and approvals so you can request specific members of your team, or a whole group, to either view or approve your work. It saves unlimited versions of your work etc too.
You can also integrate it with Google apps too- Google Drive/Docs/Calendar etc, with a single sign on.
If you need to know any more, just ask- I work for Clinked :)