I disagree. You should be able to talk about your idea to get feedback and certainly to gauge any sort of possible market. Few ideas are truly unique, perhaps

I disagree. You should be able to talk about your idea to get feedback and certainly to gauge any sort of possible market. Few ideas are truly unique, perhaps everyone else who had the same idea just didn't think there was a good enough market to be worth pursuing. Someone stealing my idea would be one possible positive indicator for me but I would still need to do a lot more market research. If there is a decent market for your product / service, then there is likely room for multiple competitors. At that point, it's all about implementation rather than speed to market (though speed to market is still important for you because the faster you get the product built the faster you are able to start seeing money from your efforts.) History backs this up with examples everywhere. Don't worry about people stealing your ideas.