When Mark Zuckerberg stepped onto the stage at San Francisco's Chase Center in September, he wasn't just making a rare public appearance; he was sending a message. Clad in a self-designed T-shirt ...

If you didn’t see a wide open market for custom T-shirts, I wouldn’t fault you. But a startup called Teespring is generating a huge buzz at Y Combinator’s demo day. The company presented today to a ...