california, chilling with mark zuckerberg of the facebook.com, and we're drinking out of a keg of heinekenecause... what are we celebrating, mark? >> we just got three million users. >> 11, 12, 13... >> whoo! >> tell us, you know, simply what facebook is. >> i think facebook is an online directory for colleges. i realized that because i didn't have people's information, i needed to make it interesting enough so that people would want to use the site and want to, like, put their information up. so we launched it at harvard, and within a couple of weeks, two-thirds of the school had signed up. so we're, like, "all right, this is pretty sweet, like, let's just go all out." i mean, it's just interesting seeing how it evolves. we have a sweet office. >> yeah, well, show us... show around the crib. (talking in background) we didn't want cubicles, so we got ikea kitchen tables instead. i thought that kind of went along with our whole vibe here. >> uh-huh. what's in your fridge? >> some stuff. there's some beer down there. >> how many people work for you? >> it's actually 20 right now. >> did you