Stackoverflow has https://meta.stackoverflow.com/ https://meta.stackoverflow.com/ and https://chat.stackoverflow.com/ https://chat.stackoverflow.com/ (you see i

Stackoverflow has https://meta.stackoverflow.com/ https://meta.stackoverflow.com/ and https://chat.stackoverflow.com/ https://chat.stackoverflow.com/ (you see it when the comments on a question or answer go on too long, there's an automatic "comments are not for extended discussion, take it to chat" reply, or you can invite people to a chatroom about a question).