Interesting, inviting people would seem to be the first difficulty. Consider this: I want to chat with certain people about a certain topic (such as a product

Interesting, inviting people would seem to be the first difficulty. Consider this: I want to chat with certain people about a certain topic (such as a product feature at work). I want it archived but only visible to the participants unless I add someone later or make it public. I want a url that acts as an invite and a convienient way to invite someone, in which they receive an email. I also want to be able to pre-invite people ( a group) and then I could paste a link in our Skype chat that everybody in that group gets auto-added to this chat. When I'm done I want to be able to have the URL be a wiki, with export as HTML or Markdown. I want it to support Markdown. I also want to be able to promote a chat message to a post and have it appear expanded and formatted in the wiki.