Where else should you look to have real conversations about topics you care about online?
This is also a great trick for figuring out really obscure problems by the way. Error message returning no results when you Google it? Slack and discord aren't crawled by search engines (sadly). Join the relevant channel and search there. Very often you'll get the result you were looking for.
I also keep in touch with two buddies from junior high, we write nearly every day in a Messenger group.