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Since there is a limit on the number of startups we can accept for this beta test of the Fellowship, we had to turn away a huge amount of promising groups. Hopefully in the future, we can expand the Fellowship and fund even more companies this way.
Unfortunately beyond that, we can't give you individual feedback about your application. This page explains why: http://ycombinator.com/whynot/
That said, we sincerely hope you'll apply to YC's winter batch. Applications for that are scheduled to open the week of August 24th.