How to find contact CHATS and a telegram (sane from 30 people)?

Question

In contact with

It is very interesting to be in touch in a chat
where there are a lot of smart sane Russians,
but I rarely even saw a chat of more than 50 people in contact.
(It's great to ask for advice and links and books in the chat ..)
They advised to look for a list of cart chats on sites, but there are basically all deranged minorities and drug addicts.
It was advised to search in contact for the word join, but there are mostly small chats for 10 schoolchildren.
And groups in VK (Russian techies or scientists) - only 5% with chats, and then, half-empty and mostly alcoholic students