Assume the best but hire paranoid people.
I tried to be a ski bum when I stepped away from Twitter, and I wasn't a very good skier.
Marketing, when done well, is about story telling.
Change the world. Build a business. Have fun.
I suspect there's a lot of validity to the premise that big companies aren't going to attract entrepreneurial talent.
The things that keep nagging at you are the ones worth exploring.