Who cares who came up with the idea first? Ideas are nothing until they're put into action.
Mark Zuckerberg stole the idea of a collegiate social networking site from the Winklevoss twins and ran with it to build Facebook.
Ideas comes down the person(s) or company willing to take responsibility for funding the idea and being determined to make it happen. That's why ideas should be free, like code.
You should feel free to steal ideas because at the end of the day it's about the execution.