Mark Zuckerberg quotes and aphorisms about really Mark Zuckerberg ,, Really, who you are is defined by the people who you know - not even the people that you know, but ... Mark Zuckerberg Mark Zuckerberg Mark Zuckerberg ,, I mean, we've built a lot of products that we think are good, and will help people share photos and... Mark Zuckerberg ,, The real question for me is, do people have the tools that they need in order to make those decisio... Mark Zuckerberg Mark Zuckerberg Mark Zuckerberg Mark Zuckerberg Mark Zuckerberg