Which CMS to choose for a social network is free or for a moderate fee?

Question

CMS

Please advise a CMS for a social network for free or for a moderate fee
. Most likely, it should be either a CMS with a social plugin or a CMS tailored for sociality
Tasks:
Personal account: video broadcast block start / join) For everything related to the transmission of video-audio there is a programmer.
Text chat (probably a plugin)
Private messages
Gifts
MVC
SEO
Tags (for Seo)
Plugins
Not very complicated disabling of unnecessary plugins and body kit
Not very difficult to change templates or anything similar
Large community of developers
Easy to develop and maintain
Minimal server load (Apache, mysql, nginx)
Mob version?
Easy implementation of advertising

Answer 1

livestreetcms.ru

Answer 2

Dolphin