Feedback..

a) Nice clean UI.

b) Move send/cancel to top or side, away from the word-suggestion-list. I kept cancelling when choosing words from the word list as I typed.

c) Any way to allow me to choose the radius? 21km seems arbitrary. I might want just people on my block to see it, or people in Dallas/Fort Worth (50km away). Obviously there should be an upper limit, but that could also be opened for a price, say for political campaigns.