How is Dogebook different than Facebook? I mean you can create an account in both, follow your friends, "like" stuff...etc. They are essentially the same so they must both be worth billions, right?

What makes bitcoin different is the network effect and the infrastructure - there are many people who think bitcoin is the cryptocurrency and this is a self-fulfilling prophecy. Some day another cryptocurrency may overtake it but for now it's the one because people say it's the one.