A lot of people have said a lot of great things about Steve Jobs. And for good reason: he built the world's second-most valuable company, with billions in profits and products that have improved every aspect of our lives. But Steve didn't get there by being a soft, fluffy, Kumbaya-type leader.

I'm not trying to make friends, I'm trying to make money.

I see negotiations as an honest attempt to reach a deal that's great for everyone at the table. But sometimes, for whatever reason, that's impossible. You need to accept that possibility-don't make a deal for the sake of making a deal. If you do, chances are it will fall apart later anyway, with costs and headaches for everyone involved. And once you walk away, don't come back.

I look at Twitter as brand building.

As far as I'm concerned, Twitter has wiped out Facebook. I'm done with Facebook.

So much of life is a negotiation - so even if you're not in business, you have opportunities to practice all around you.

Nobody has a monopoly on good ideas