I ALWAYS use "we" whenever I'm talking about my company or anyone that I partner or work with (regardless if its my idea or my..whatever). I think its one of the reasons why people enjoy working with me, it makes the other person feel personally involved in the project and this in turns increases the liklihood that they will want the product or whatever it is I am working on to succeed. It aligns you with them. This is just what I have found. I also found that when I worked at Google even though I was the youngest person in the office whenever I used the word 'we' it made me seem like a team player and as a result was brought into the inner circle of the office, made friends faster, developed better connections. Its a bit hard to explain but I always use we.