I say it again. A chat would be really difficult and saying the contrary would be made by someone who doesn't go on the chat during games. Small, overcrowded, flooded and of course trolled and flamed. Forums are far more manageable.
Once again the naysayers say nay...
A chat like this would be moderated, so one person would receive all the questions, pick a few and those would be answered. I frequently take part in such events as one of the major newspapers in Austria offers moderated chats with interestin persons.
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A PR-BB would be nice? Srsly? I think we already have two of them, don't we?