Okay, I think there are use cases for certain.<p>Two more questions then:<p>How will moderation be handled? Public discussion that are open to join will encounter this problem at some point. Will the person who opened the discussion have carte blanche powers to delete replies? If so, does this limit the use of the platform for honest discussions if one side of the conversation can censor the other? Or will you simply trust that the user will apply his best judgment? If the moderation isn't handled by the discussion starter, then what?<p>What's the plan to distinguish yourself from competitors? Assuming the concept takes off, it doesn't look as if the site functionality itself is too challenging to duplicate. What'll be your advantage?<p>(edit: I hope you find these questions useful, rather than annoying.)