Ask HN: We are running a contest, can you share your thoughts?

Let me start by briefly introducing our app. Arima is a Q&A site for Mass Opinion. Unlike traditional Q&A sites like Quora or Yahoo Answers, which focus on expert advice, we focus on mass opinion and try to help users to aggregate data and visualize data submitted by others all around the global. In a simple sentence, think of us as Quora for Numbers. Please have look at http://arima.io We are running a contest called 30 Days for 30 Prizes (http://insights.arima.io/post/99188609271/arimas-social-contest-30-days-for-30-prizes). Anyone here has experience running contests and would like to share their stories? Or would like to help us spread the words? Thanks!