Founders are supposed to be not at all interested in selling. But there is a price at which a founder can't help being interested.

It thrills me to write reference letters for enterprising founders who are looking to get visas to start their companies here, to create value and jobs for these United States.

What makes Reddit special is that people feel free to express themselves. Where we want to draw the line is where that feeling of being able to express oneself freely starts to infringe on someone feeling like they can express themselves.

The best part of being an angel investor is seeing these kids coming up with companies that get way more traffic than Reddit had when we sold it. I think, 'Are you kidding me? They're just kids, and they've done so much.'

Being effective at social media, whether for business or personal use, means capturing people who have short attention spans. They're only a click away from a picture of a funny cat, so you have to make your thing more compelling than that cat. And that can be a high bar.

It takes discipline not to let social media steal your time.