Mark Zuckerberg quotes and aphorisms about different 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 ,, I mean, we've built a lot of products that we think are good, and will help people share photos and... Mark Zuckerberg Mark Zuckerberg Mark Zuckerberg Mark Zuckerberg ,, Video is growing very quickly on Facebook. A lot of people compare that to YouTube. I think that ki... Mark Zuckerberg Mark Zuckerberg Mark Zuckerberg