Which social networks provide corporate accounts for business?

And whether there are some convenient services that allow you to create your enterprise social network with access control via groups, private messages and a common tape type Facebook, Vkontakte, Google+, etc.?
The groups should be as convenient to download and view a variety of materials (documents, photos, videos, links). And convenient to manage these groups, and all accesses.

PS Bitrix24 does not offer - there is, in my opinion, is not very usable interface for this task, and too many clicks needed to do to work at least with dozens of groups and dozens of posts in the feed. And it should really be conveniently and quickly for a large number of groups and employees (from hundreds to several thousand).
June 8th 19 at 16:50

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June 8th 19 at 16:52
Closed group in the VC is not satisfied?
When such groups will be a hundred or a thousand, it will be convenient to manage them within your social networking sites? Combine them in the fields or in some kind of hierarchy? - antoinett commented on June 8th 19 at 16:55

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