interesting.
I asked a question just to see how it works. got an answer in my email in about 5 minutes.
seems that you can use the GMail Chat, Instant Messenger, Twitter, Email and the Aardvark website to ask question.
i think if you use the IM or GMail Chat, you get responses back in the chat. if you use Twitter,you get a Direct Message. anything else, you get an email.