Well, i think its unethical, By leaking out the TOP things of "your" company.. If you think you are making your company strong in this way, then you can make a company "Stronger" By keeping it to you and your friends!
Your friends and peers are your partners, they help you, share everything you and they expected to do the same from us! Okay, if you don't want to share yourself but You can help them out! Its totally unethical that you are taking an advantage but exactly putting your friends at the double disadvantage. Firstly, he/she trust you by sharing yourself, no matters what he/she is sharing You deceived them. secondly, after deceiving them, you are now letting others know about their plans, suggestions and ideas. Its unethical!