Happy 40th birthday, Mark Zuckerberg! Can you believe it, the creator of Facebook is now officially over the hill! But we all know age is just a number and you haven't slowed down one bit. From launching the social media revolution to supporting countless charities, you've truly changed the world in your first 40 years. So here's to many more years of innovation, inspiration, and of course, viral cat videos. Cheers to you, Mark!