I think you will find that there is less and less of a secretive nature around the software community, and people are willing to share and discuss ideas fairly freely without worrying about stealing. This inevitably leads to stronger ideas when we can flesh things out together. There are websites such as http://www.cofounderslab.com/ where you can meet people, however you still have to trust them to share your idea with them. I've met a few random folks over the years at programmers / entrepreneurs meetups and we have discussed our ideas fairly openly.