A lot of what I experienced growing up in the U.S.S.R. and coming to the U.S. as an immigrant actually reflects itself in Whatsapp. Experiences from our youth shape what we do later in life.

Advertising isn't just the disruption of aesthetics, the insults to your intelligence and the interruption of your train of thought. At every company that sells ads, a significant portion of their engineering team spends their day tuning data mining, writing better code to collect all your personal data.

As long as our user base continues to grow, at some point it will have critical mass, and at some point it will tip, and at some point, people will just have to use WhatsApp because their friends are using WhatsApp.

I had so much fun in early days learning about networking, security, scalability and other geeky stuff.

I have this necklace I always wear. I collect pendants from people I love; my best friends and members of my family have all given me one, and I put them on this chain so no matter where I am they're always with me.

I took solace in my relationship with God who, along with my dog, was my best friend growing up.

When David Fincher called me up a few years ago and said, 'Hey, I'd like you to score this film 'The Social Network,' I said, 'I'm flattered, but I really don't have any real experience scoring films, and I'd rather not screw it up on a high-profile project. And I like you and I don't want to compromise our friendship.'

I started doing improv in college, and I met Mike Birbiglia and John Mulaney and a bunch of other very funny, talented people who I'm still friends with and work with.