His $1 salary, definition of happiness, fitness plan... Mark Zuckerberg answers all on Facebook Q&A

Facebook CEO Mark Zuckerberg connected with his social networking community on Tuesday by answering an interesting mix of questions on Facebook in an hour-long session, including ones from actor-turned-politician Arnold Schwarzenegger, The Huffington Post Editor-in-chief Arianna Huffington and Physicist Stephen Hawking.

"Our Townhall Q&As are an important way for me to hear what our community is thinking about," Zuckerberg said in a post on Facebook, inviting questions from all.

Here are a few questions that caught our eye:

1. Arnold Schwarzenegger [Actor and former Governor of California]: ...You've got to be one of the busiest guys on the planet... Tell me how you find time to train and what is your regimen like? And by the way - will the machines win?

Zuckerberg: Staying in shape is very important. Doing anything well requires energy, and you just have a lot more energy when you're fit. I make sure I work out at least three times a week -- usually first thing when I wake up. I also try to take my dog running whenever I can, which has the added bonus of being hilarious because that basically like seeing a mop run. And no, the machines don't win.

2: Why did you come up with Poking?

Zuckerberg: It seemed like a good idea at the time.

3: Can you jump over a chair like Bill Gates?

Zuckerberg: Great question. Maybe, but we're not going to find out today.

4. Arianna Huffington [The Huffington Post Editor-in-chief]: ... How do you think the way journalists and news organizations present their stories online will evolve over the next few years? And what types of products are you focused on in this space?

Zuckerberg: I think there will be a couple of trends towards richness and speed / frequency. On richness, we're seeing more and more rich content online. Instead of just text and photos, we're now seeing more and more videos. This will continue into the future and we'll see more immersive content like VR. For now though, making sure news organizations are delivering increasingly rich content is important and it's what people want. On speed / frequency, traditional news is thoroughly vetted but this model has a hard time keeping us with important things happening constantly. There's an important place for news organizations that can deliver smaller bits of news faster and more frequently in pieces. This won't replace the longer and more researched work, and I'm not sure anyone has fully nailed this yet.

5. Stephen Hawking [Physicist]: ...Which of the big questions in science would you like to know the answer to and why?

Zuckerberg: That's a pretty good one! I'm most interested in questions about people. What will enable us to live forever? How do we cure all diseases? How does the brain work? How does learning work and how we can empower humans to learn a million times more? I'm also curious about whether there is a fundamental mathematical law underlying human social relationships that governs the balance of who and what we all care about. I bet there is.

6. Why did you choose to set your salary at $1?

Zuckerberg: I've made enough money. At this point, I'm just focused on making sure I do the most possible good with what I have. The main way I can help is through Facebook -- giving people the power to share and connecting the world. I'm also focusing on my education and health philanthropy work outside of Facebook as well. Too many people die unnecessarily and don't get the opportunities they deserve. There are lots of things in the world that need to get fixed and I'm just lucky to have the chance to work on fixing some of them.

7: What's your definition of happiness? And how has it evolved over a period of time as you grew up?

Zuckerberg: Great question. To me, happiness is doing something meaningful that helps people and that I believe in with people I love. I think lots of people confuse happiness with fun. I don't believe it is possible to have fun every day. But I do believe it is possible to do something meaningful that helps people people every day. As I've grown up, I've gained more appreciation for my close relationships -- my wife, my partners at work, my close friends. Nobody builds something by themselves. Long term relationships are very important.

8: ...My 10 year old, however, wants to ask you what you would take to a desert island with you if you could only take three things (FYI there is no WiFi there, so no FB).

Zuckerberg: That depends. Have we successfully delivered satellite connectivity through Internet.org yet? Because we're working on this, and in the not too distant future, I'm pretty sure there will in fact be wifi on that island. In that case, I'll bring my wife, my dog and my phone. Otherwise, I guess I'd just bring my wife, my dog and a book.

9: Whats going on with Facebook in the future?

Zuckerberg: There are a few important trends in human communication that we hope to improve.

First, people are gaining the power to share in richer and richer ways. We used to just share in text, and now we post mainly with photos. In the future video will be even more important than photos. After that, immersive experiences like VR will become the norm. And after that, we'll have the power to share our full sensory and emotional experience with people whenever we'd like.

Second, people are gaining the power to communicate more frequently. We used to have to be with someone in person. Then we had these bulky computers at our desks or that we could carry around. Now we have these incredible devices in our pockets all the time, but we only use them periodically throughout the day. In the future, we'll have AR and other devices that we can wear almost all the time to improve our experience and communication.

One day, I believe we'll be able to send full rich thoughts to each other directly using technology. You'll just be able to think of something and your friends will immediately be able to experience it too if you'd like. This would be the ultimate communication technology.

Our lives improve as our communication tools get better in many ways. We can build richer relationships with the people we love and care about. We know about what's going on in the world and can make better decisions in our jobs and lives. We are also more informed and can make better decisions collectively as a society. This increase in the power people have to share is one of the major forces driving the world today.

10: How will you react if you woke up next morning and there is no Facebook?

Zuckerberg: I'd build it.