Angry Birds is one of the fastest-growing online products I've seen, growing even faster than Skype, and the company has done a brilliant job of extending it across different platforms and merchandise.

If you want to be an entrepreneur, it's not a job, it's a lifestyle. It defines you. Forget about vacations, about going home at 6 pm - last thing at night you'll send emails, first thing in the morning you'll read emails, and you'll wake up in the middle of the night. But it's hugely rewarding as you're fulfilling something for yourself.

Another differentiator is that Skype is free and simple to set up, and it costs us virtually nothing for a new user to join the Skype network, which is why we can offer the service for free.

I hope that my investment into Atomico will become my best financial investment to date.

I don't have the relationship that I thought I did with my fans. Maybe I did early on when I had a couple thousand fans, but it's not like us anymore. It's the idea of Notch and the 'Minecraft' community.

For me, the toughest thing for kids to deal with is when the parents are fighting. It's not violence on them - it's the feeling of violence in the family.

I didn't emphasize my Jewishness because I wanted to. I just happen to have been raised in a family where everybody happened to talk like this, so why would I talk like somebody else?

Of course, my family helped me, my brothers helped me, but after I set up my own office I had to really help myself. Some people seem to think I had an oil well in my garden! It's a nice idea but not true.