[tzs]

> At ENSIME the vast majority of communication is through popular channels: github.com (non-free), gitter.im (non-free), meet.jit.si (libre) and twitter.com (non-free)

How does one know which of those four channels to use? Are people expected to follow all four of them if they want to keep informed about the project?

Wouldn't it be easier to have just one channel that is universally available? Email would be the obvious choice, and since you have to provide an email address to sign up at Github, you are already implicitly requiring your contributors to have email.