Looking for a developer or consulting firm

I have a revolutionary idea. I am afraid of having it stolen from the people i sspeak to about it. How do i protect myself? Also, I am not a programmer or developer, who do i speak to about developing and designing my platform. are there any reputable firms that specialize in social media development consulting? I am looking to hire a firm or individual with an impressive track record and resume. The idea is very similar to foursquared in structure but a whole new idea with a much bigger market cap.