It is called Taaalk. It is a platform for conversations that are closed (only who you invite) and public (anyone can read them). People can choose to "follow" a Taaalk and they will get email updates every time someone posts a reply.
Taaalk has a few features I'm very proud of. It has a pretty message preview section that looks like this:
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Every time you join a Taaalk you can customise your "speakers" profile for that particular conversation: You can choose the colour of your speech bubble, as well as have a specific image, bio and twitter handle. You can even join the same Taaalk multiple times and have different profiles if you wanted to Taaalk to yourself!
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Taaalk also has a handy "Reply" section. This keeps tracks of all the Taaalks you are in and lets you know if it looks like you have some replies to make.
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When you're in a Taaalk sometimes you can have ideas for things you want to bring up later in the discussion. Because of this I built a notes section that every "speaker" has: