Dolgan from Penumbra set up a joint SSX/Penumbra chat channel.
This is an in-game chat channel, like kin chat.
You'll have to join it manually though:
Right click on the "general" tab of your chat window, select "change filters" and "user chat 1."
at the chat prompt, type: (without the quotes)
You should get the following message:
You joined room 'SSX-Penumbra' (UserChat1).
(*If you already have a userchat channel assigned, it'll say "UserChat2" on up.)
type /1 to use this channel.
If you need any help, let me know