"My friends are people who like building cool stuff. We always have this joke about people who want to just start companies without making something valuable. There's a lot of that in Silicon Valley"

Mark Zuckerberg is making a joke about the Silicon Valley culture of wanting to begin companies without making something important. He is suggesting that the people who are concentrated on starting companies without making something of value are not his good friends. He is suggesting that his buddies are individuals who like to develop cool stuff, which is a more significant and satisfying venture. He is indicating that the Silicon Valley culture of wanting to start business without making something of value is not something he values or appreciates. He is recommending that his friends are people who are concentrated on producing something of value, which is a more significant and fulfilling venture. He is indicating that the Silicon Valley culture of wanting to start companies without making something of value is not something he values or appreciates.