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Codetalk is two part: codetalk-the-company and codetalk-the-organization. While both are closely tied, codetalk-the-organzation includes a larger number of brilliant people from around the world.
The servers and infrastructure is maintained by codetalk-the-company. You can find more information about the organization at the codetalk information page.
There is both an IRC and a Slack team (and a bridge between the two) which is used in the organization. Newcomers are generally welcomed!