Not sure how to help you prepare for a TED talk but I do think its badass you will be giving one! Good on ya!
One consideration is how much of a threat Steemit is to Facebook, and nobody see's it coming, I often wondered what the next Facebook would be, and I believe this is it, and how sweet to be an early adopter :)
Good Luck!
F&UV
You may want to check out @stan. Some of the best posts I have seen, mostly about Bitshares, but good