Popular chat software? (especially for android) Limits?

Question

Social media

Need a list or names of chat services .. (especially for android client 4-9)
And most importantly, their features and limits
(History and black list and privacy and anonymity and limit of participants and anonymity and text search and administration tools)
Asya - 10,000 participants?
Cart - maximum privacy?
And anonymity is only in the bit messenger or on the i2p forums?
Popularity is VK chat+viber+whatsapp?
What are the most popular chats in the Russian-speaking world besides VK?

Answer 1

yes , the answer is obvious
.

Answer 2

Antox - (based on the Tox protocol) a free and open source private communication program. I haven't heard of limits. There is a history, black list, text search.