Nobody is going to steal your idea

Unless you run into this guy; http://news.ycombinator.com/item?id=3825533

Hmm... I agree that nobody is going to steal most of your ideas.

But a very few of them do require secrecy (in the cases I've seen, it was serving a very narrow niche or exploiting a loophole, nothing revolutionary, but that would have been spoiled if someone implemented them ahead of the guy with the idea)

Again, you don't need to spill your secret sauce to share your idea.

Or http://www.economist.com/node/21525394 or zynga :)