Cool idea, clever roll out. How did you collect the pitches? I was surprised and flattered to see my company (Common Form) included.
We added all Startups exclusively through the AngelList API - it exposes Startups currently marked as fund raising. Also people can submit their suggestions as long as the Startup is listed on AngelList itself and matches a certain quality score.
And then we also went ahead and added promising startups manually ourselves :)