While I am searching answers on Stack Overflow site, there are some users that are known of that technology of my concern and often answered related to the same term that I am asking for.
May I know how do I start chat with him/her for my answer?
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Open that user's chat profile link..
This is user profile link
add "chat" word before stackoverflow.
and click on start new room with this user
you can also invite to in room .