He received lots of serious questions, and tried his best to answer them.
But, because it's the internet, he also got lots of not-so-serious questions.
Like this one, referring to the time someone hacked his LinkedIn account with a very easy password:
And this one, looking for some updated user interface:
And this bloke who was just a bit too friendly:
This one gave a little bit too much information:
And a few more were spotted on Twitter:
But the only funny question Mark answered? Some wanted to know if he's a shapeshifting lizard person.
But that's exactly what a shapeshifting lizard person would say.