Mark Zuckerberg quotes and aphorisms about kind 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 ,, Video is growing very quickly on Facebook. A lot of people compare that to YouTube. I think that ki... Mark Zuckerberg ,, I always kind of see how I want things to be better, and I'm generally not happy with how things ar...