good answer. I actually would rather ask specific question to a specific person trying to capture their brain, rather than shooting my question into the ocean of internet. if you execute properly, this may be big. think email versus twitter - twitter wins on so many level because people can always "let go" conversation and never been spammed with questions, versus email when once given out, a popular individual would have to quickly change it before drowning in spa,. this way if some tech celeb (or any celeb in that matter) is willing to answer questions, he/she may signup to your site and say "hey im ready to answer, ask me a questions".

best luck to you!

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