Free corporate social network/portal?

Question

Social media

The company is actively growing and the question arose of how to establish communications within the company. As a result, we thought about some thread of a social network / corporate portal. Of the functionality, you need a forum, blogs (both private - employees with their own interests, and official ones - company news, etc.), photo albums.
No one faced a similar problem, where did they stop?
The software must be free and under *NIX.

Answer 1

I recommend Drupal to you. The dru.io site works great, you can take an example from it.
to send messages like in VK you need to use Nodejs for this you need to configure your server, install software