Facebook has 3 billion monthly active users. It's not dead by any definition of the word. Even if you and I don't use it, many people around the planet do. It is simply that we are not in the target market anymore, but don't discount 3 billion people, that's around 30-40% of the world's population. Cultural relevancy doesn't matter as long as Facebook still has the install base to show ads to, which is how it makes its money, and why its stock is still one of the best performing in the business.