What are the CMS similar to social networks with the required functionality (inside)?

Question

CMS

1. Messaging between users
2. create an event (event) where users can participate and attach files
3. File directory (not a bunch, but a directory with subdirectories)
4. Groups
5. News feed (as in a contact) for subscribed groups, events, friends updates
6. Add to friends
7. Russian community (plugins, templates, etc.)
8. Not a dead project
9. Free

Answer 1

humhub